I sold a book earlier this month on a book selling site, and turns out they deposited the total twice. Instead of a single deposit of 66 bucks, they made two deposits of 66 bucks for a total of 132. I'm thinking about keeping it..but I don't want them coming back later saying we made a mistake..blah,blah, blah. I'm not really afraid of that but whatever, they should've been careful. what do you think?