In September 19-25 issue of The Economist, there is an article about information published in Washington Post which has allowed persons to duplicate the keys to open "TSA-approved" locks. Apparently, the newspaper published some high definition photos of the keys that are detailed enough to allow duplication by 3d printers, and it appears that has been done.
I can't post link as I only have access to paper copy, but maybe someone else will, or knows more.
I've never used the locks anyway, but I know many people do.