I have had my locks opened and have "lost" items in my bags on occasion. But in most cases, because of the item, I just assumed it was forgotten and didn't think twice. One of the times, I had some merchandise that was for a convention, each item was marked carefully and I had written on the top what was in each bubble wrap and how many. Each item was opened and one item from each package went "missing". I don't find that accidental. I filed a claim with TSA and of course it was denied even though I could provide receipts for the missing items. It was quite frustrating.