Tomorrow, Jack in the Box is giving away free tacos...

It can be any gas receipt, according to Jack in the Box's web site that they created, just for this taco giveaway, so I gather if it's some old receipt from 1978 that you pulled out from under your bed, that's okay. But they can't be copies or duplicates of gas receipts. It has to be real. Marketing gimmicks have their standards, after all.
But, hey, I'm not complaining. As I mentioned, free is good. Just keep in mind that if you have to drive even 10 miles to get these free tacos, depending on how much mileage your vehicle gets, you may not be saving much. But if you're near the restaurant, anyway, and like tacos, why not?