Yeah, there's no way they fell out or were removed "on a whim." I've been riding motorcycles for nearly 40 years. I've had some real "gems" (Like a Jawa CZ, a Hungarian bike!) and NEVER have I had a fork bolt so much as loosen, much less fall out, or had a brake line come unscrewed.
Someone is trying to kill you. There's no other way to say it. Invest in a better camera and / or find someplace where you can lock the bike inside securely. And FILE A POLICE REPORT! Seriously, it may not do anything, but you never know. Maybe it's some sicko who just hates motorcycles doing this to a bunch of bikes.
If you find the guy, let us know. I'm sure some of us would like to help you "address the situation" personally!