Why do you think they didn't leak sooner? It's trivial to reverse-engineer the master keys with a few example locks. Also, whenever I see an article about black-market tor sites that lists examples of available contraband, "sets of TSA / (city) master keys" are frequent fliers.
This is a problem with common thinking these days: " general belief that only some good guys have the keys". I paid for the device, I should get the keys!
The average mechanical key user (i.e. the average non-homeless person) certainly knows that someone can duplicate a key given access to the key. But the average key user doesn't know that a mere picture, much less a picture from hundreds of feet away, is sufficient. When was the last time you saw someone hide a key from view while using it? I've never seen anyone do this. I've never done it myself.
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