New evidence may suggest Las Vegas shooter Stephen Paddock was not alone in hotel room

Investigators are looking into two key pieces of evidence that seem to suggest that Las Vegas shooter Stephen Paddock was not entirely alone in his Mandalay Bay hotel room.

Senior law enforcement officials told NBC News that they have made two discoveries in Paddock's 32nd-floor hotel room that they currently cannot explain.

The first is a cell phone charger that does not match any of the devices that belonged to the gunman.

The second is a hotel record showing that one of Paddock's key cards was used to access his room while his car was outside of the hotel's parking garage.

RELATED: Here's what we know about Stephen Paddock

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What we know about Las Vegas shooting suspect Stephen Paddock
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What we know about Las Vegas shooting suspect Stephen Paddock
Stephen Paddock, 64, allegedly opened fire from the Mandalay Bay Resort and Casino on the Route 91 Harvest country music festival, leaving at least 59 people dead and hundreds injured.

(Social media/Handout via REUTERS)

He reportedly used a hammer-like tool to break out two windows at the Mandalay Bay Resort and Casino.

(Photo by David Becker/Getty Images)

Stephen Paddock was reportedly a high-stakes gambler that lived in a retirement community in Mesquite, Nevada.

(REUTERS/Las Vegas Sun/Steve Marcus)

His father was Benjamin Hoskins Paddock, a bank robber and former FBI Most Wanted Fugitive.

(FBI/Handout via REUTERS)

Paddock killed himself before authorities breached his hotel room and investigators say he acted alone.

(REUTERS/Las Vegas Sun/Steve Marcus)

Paddock's girlfriend, Marilou Danley, was in the Philippines at the time of the shooting but he reportedly used her identification to check in at the Mandalay Bay hotel.

(Las Vegas Metropolitan Police Department/Handout via REUTERS)

Stephen Paddock lived in this home in Melbourne, Florida from 2013 to 2015.

(Joe Burbank/Orlando Sentinel/TNS via Getty Images)

Police said Paddock had no criminal record.

(Photo by David Becker/Getty Images)

NBC News reported that Paddock made several large gambling transactions in recent weeks, but that it wasn't clear if they were wins or losses.

(Photo by David Becker/Getty Images)

Paddock reportedly purchased firearms at  Guns & Guitars, a gun shop in Mesquite, Nevada. 

(Photo by Gabe Ginsberg/Getty Images)

Paddock's brother, Eric, said his sibling belonged to no political or religious organizations, and had no history of mental illness.

 (Photo by Marcus Yam/Los Angeles Times via Getty Images)

Paddock's brother described him as a "wealthy guy" and said he liked to play video poker and go on cruises.

(Photo by Gabe Ginsberg/Getty Images)

He worked as an accountant and had real estate investments, according to the Washington Post. 

(Photo by Drew Angerer/Getty Images)

Paddock had his pilot license and owned at least one plane, according to Reuters.

(REUTERS/Lucy Nicholson)
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Investigators told NBC News that while there are many possible explanations for these two puzzling finds, they are hoping to get to the bottom of things immediately.

A mysterious piece of paper was also found in the shooter's hotel room, where he opened fire on the Route 91 Harvest country music festival Sunday night, killing at least 59 concertgoers and injuring more than 500.

Although investigators have confirmed it is not a suicide note, there has still been much speculation about what may have been on the paper.

SEE: Life in Las Vegas after the shooting: 

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Around Las Vegas after the shooting
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Around Las Vegas after the shooting
Las Vegas Boulevard remains closed near the mass shooing site at the Route 91 Harvest Country Music Festival in Las Vegas, Nevada, U.S., October 2, 2017. REUTERS/Mike Blake
A man stands next to a bouquet of flowers along a pedestrian walkway looking towards where a mass shooing at the Route 91 Harvest Country Music Festival took place Monday night on the Las Vegas Strip in Las Vegas, Nevada, U.S., October 2, 2017. REUTERS/Mike Blake
LAS VEGAS, NV - OCTOBER 3: Law enforcement vehicles gather near one of the entrance points to the concert venue where Sunday night's mass shooting, October 3, 2017 in Las Vegas, Nevada. The gunman, identified as Stephen Paddock, 64, of Mesquite, Nevada, allegedly opened fire from a room on the 32nd floor of the Mandalay Bay Resort and Casino on the music festival, leaving at least 58 people dead and over 500 injured. According to reports, Paddock killed himself at the scene. The massacre is one of the deadliest mass shooting events in U.S. history. (Photo by Drew Angerer/Getty Images)
LAS VEGAS, NV - OCTOBER 3: Las Vegas Blvd. remained closed to vehicular traffic near the scene of Sunday night's mass shooting, October 3, 2017 in Las Vegas, Nevada. The gunman, identified as Stephen Paddock, 64, of Mesquite, Nevada, allegedly opened fire from a room on the 32nd floor of the Mandalay Bay Resort and Casino on the music festival, leaving at least 58 people dead and over 500 injured. According to reports, Paddock killed himself at the scene. The massacre is one of the deadliest mass shooting events in U.S. history. (Photo by Drew Angerer/Getty Images)
Las Vegas Boulevard lights-up with with signs for the victims and first responders after a mass shooing at the Route 91 Harvest Country Music Festival in Las Vegas, Nevada, U.S., October 2, 2017. REUTERS/Mike Blake
Las Vegas Mayor Carolyn Goodman hosts a prayer vigil, in honor of those affected by the shooting on the Las Vegas Strip, in front of Las Vegas City Hall in Las Vegas, Nevada, U.S. October 2, 2017. REUTERS/Las Vegas Sun/Steve Marcus
A churches cross is lit by fading daylight as it towers over the scene in front of the stage following a mass shooing at the Route 91 Harvest Country Music Festival on the Las Vegas Strip in Las Vegas, Nevada, U.S., October 2, 2017. REUTERS/Mike Blake
People stand along a pedestrian walkway looking towards where a mass shooing at the Route 91 Harvest Country Music Festival took place last night on the Las Vegas Strip in Las Vegas, Nevada, U.S., October 2, 2017. REUTERS/Mike Blake
Women walk down the Las Vegas strip after roads were closed near the site of the Route 91 music festival mass shooting outside the Mandalay Bay Resort and Casino in Las Vegas, Nevada, U.S. October 2, 2017. REUTERS/Lucy Nicholson
Las Vegas Boulevard lights-up with with signs for the victims and first responders after a mass shooing at the Route 91 Harvest Country Music Festival in Las Vegas, Nevada, U.S., October 2, 2017. REUTERS/Mike Blake
Las Vegas residents Karen Stevens (L) and husband Mark Stevens attend a candlelight vigil at Las Vegas City Hall October 2, 2017, after a gunman killed at least 58 people and wounded more than 500 others when he opened fire on a country music concert in Las Vegas, Nevada late October 1, 2017. / AFP PHOTO / Robyn Beck (Photo credit should read ROBYN BECK/AFP/Getty Images)
LAS VEGAS, USA - OCTOBER 02 : Mandalay Hotel is seen after a gunman attack in Las Vegas, NV, United States on October 02, 2017. At least 59 people were killed and more than 527 others wounded at a country music concert in the city of Las Vegas late Sunday night in the mass shooting. A gunman -- identified as Stephen Paddock -- opened fire on more than 10,000 concert-goers at an outdoor venue from across the Mandalay Bay Hotel at around 10.08 p.m. local time (0508GMT Monday), Clark County Sheriff Joseph Lambardo from the Las Vegas Metropolitan Police Department (LVMPD) told reporters. (Photo by Bilgin S. Sasmaz/Anadolu Agency/Getty Images)
LAS VEGAS, USA - OCTOBER 02: Police block the roads leading to the Mandalay Hotel (background) and inspect the site after a gunman attack in Las Vegas, NV, United States on October 02, 2017. At least 59 people were killed and more than 527 others wounded at a country music concert in the city of Las Vegas late Sunday night in the mass shooting. A gunman -- identified as Stephen Paddock -- opened fire on more than 10,000 concert-goers at an outdoor venue from across the Mandalay Bay Hotel at around 10.08 p.m. local time (0508GMT Monday), Clark County Sheriff Joseph Lambardo from the Las Vegas Metropolitan Police Department (LVMPD) told reporters. (Photo by Bilgin S. Sasmaz/Anadolu Agency/Getty Images)
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