I wouldn't put a mark in something I was sending back, that would be defacing it tbh. I don't mind the idea of being sent returns, just so long as they've been checked throughougly before hand for problems. Obviously I wouldn't be happy about receiving a face cream had had been used or cosmetics, as among other things, you're getting less product and paying the same price, but we don't think twice about buying things from the high street that could have been tried on by millions of people!