Originally Posted by pdhenry
At least some of the TSA locks have an indicator window that tells you when the lock has been opened with the TSA key.
Correct.
Here is a picture and review of one that turn from green to red if opened and re-locked.
I have been content to use non-TSA approved locks until now, but having had such a lock cut by the TSA this past weekend, I think I am going to make the switch.