My question involves criminal law for the state of: CA

I知 a complete and total idiot and decided it was a dandy idea to return the wrong clothes to a retailer. It was one of those discount retailers. I just put the tags on old clothes. When i went to return them, the cashier asked me if they were worn and i said no. She did the transaction but kept making faces and refunded me the $50. Now im scared and dont know if ill get a letter in the mail about retail return fraud. Or how that works. Do they just show up at my door? I know for sure she was on to me. Am i free and clear now? Or how long do i live in fear? Thanks. I知 an idiot.