You must give it to the person you took it from. If you don’t know him, give it in charity.

2 years ago or so I had change given back which was around 1 to 2 pounds more than I should have been given. Do I have to pay it back as I knew I was taking it but didn’t take it out of pleasure I was walking out the shop and I am a shy guy so i didn’t know how to tell the one who served me they gave me too much money. This isnt a small shop it is a franchised store