I think people have an irrational paranoia regarding "the letter". People seem to think it can happen for anything the Sas or managers deem suspicious. However, in 99% of cases, there are MUCH bigger fish to fry than you and your occasional returns. They are targeting the big guns - the people who buy scores of items on a regular basis or the ones who buy in quantity and end up regularly returning more than they keep. Regardless of what some people claim, this just doesn't happen to the average customer and never will.