Henry, not much you can do about thieves. We share the place with paintballers, Moms, wives, and who-knows-what gaggle of other people. Its up to each of us to keep our stuff secure.
It's a PITA to do, and with our refs wanting us to hurry up and get out on field one, three.. Whatever, locking crap up slows things for everyone. Just gotta be that way.