Is AUTHOR wrong in the post ? POST : This is short, and not exactly life changing but it's something that's on my mind.

So basically, I went grocery shopping, and my total was $20.14, I only had $20's, so I paid the 0.14 on my card. As I was in my car organizing my cards, I noticed the cashier accidentally handed me my $20 back in my receipt.

I didn't go back in and correct their mistake...but honestly I feel like I should have. The only thing that isn't letting me be bothered too much is the fact that I shop a lot there, and that it's a major chain.

AITA for not correcting their mistake, even though I had a chance to?