Yes, I would have gone back. I don't shop at walmart anymore, I'm not a fan of it, but I still would have.
I'm honest to a fault a lot of the time. When I got arrested for having pot at school in 7th grade, I was intimidated by my serious PO. He asked me to verify my story and then I added, "Oh, I also had it the day before." He threw his back and laughed, looked at me, grinned, and said, "Oh, you are something else."
I guess what sticks with me is a sales clerk at a small store (no, not Walmart, but still) going over and dcoumenting everything that she sold. She did the same thing that the clerk did in this case, and when the money didn't add up she got accused of stealing and got fired.
I don't know, I try to be honest, even if it doesn't feel great to walk into a big chain store and give them more money.