One thing to also watch out for is while they will not necessarily break a TSA approved lock, they may switch it up with another similar one from another bag. This happened to my parents when they were borrowing one of my bags. They had to have the hotel staff cut it off. That gets me, if you remove it, put it on the correct bag.

Also, I have flown out of small airports (ROA, but that is changing soon) where they physically have to open each checked bag because they do not have the X-Ray scanners. They even let you watch them do it and open your bag and you can watch them put the lock back on. What I think is silly is they waste the piece of paper saying they went through your bag when you saw them do it yourself.