I messed up pretty bad at work.

I can’t say much without giving away my job- I’ll keep it simple- let’s say that I work in retail, and we have a program where if you bring a certain document you get a variety of free things.

We need the document and the receipt. It was ran through the program correctly but we misplaced the paperwork.

So I forged it, I’m hoping no one notices, but I feel like I should come clean. Should I lay low and confess if it’s brought up? Or just bring it up before the mistake is caught?