Thieves Standing Around

So, one of my bags must have been searched by the TSA on the way home. Items of toiletries had gone missing from a bag when I unpacked on getting home. No notice left in bag to show it had been searched. The bag was fitted with one of those combination TSA approved padlocks.
A USB cable for the Just Mobile Gum Pro battery pack I picked up in SF had vanished from the same bag. Do the TSA people just tip the contents out, kick it around a bit then put some back?
I have written an email to the TSA to complain but I'm not holding out hope for a reply...
Maybe TSA stands for Taking Stuff Arbitrarily?...