Sad to say but you can't trust anyone these days. Unless you live in Japan, lock up your stuff every time.
Sorry about your ID collection. I keep my old ones in my archives, especially the ones where I look like a thug.
On a side note, I'm pretty sure you misspelled "rifling" (to search vigorously) although it turns out that the word "riffling" exists (search quickly through something, especially so as to cause disorder). So I'll give you a pass.
Gawd, this sucks, but I agree - invest in a lock. It's a public gym, I presume? Hopefully lesson learned on your behalf and the karma bus hits this thief.
Sorry about your ID collection. I keep my old ones in my archives, especially the ones where I look like a thug.
On a side note, I'm pretty sure you misspelled "rifling" (to search vigorously) although it turns out that the word "riffling" exists (search quickly through something, especially so as to cause disorder). So I'll give you a pass.