I was with PMO at Pendleton. Yes, weapons and shit go missing. Some Marines are gun guys... go figure.
I remember in 05'-06' when one of the MEU's came back and was unloading, or whatever they call the process of bringing all their gear to shore, and thought they had a couple of missing M40A1's. Turns out they were stored away from the other weapons on some other pallet or something like that. But yeah, we were doing 100% vehicle checks in/out for a couple days until that got sorted out. Didn't "close the gates," but everyone was stopped.
Anyway, I'm sure missing sniper rifles would cause much more political fallout in CA than they would in NC. Besides, if the Base Commander says, "do it" the MP's do it.
You guys are/were both right.
Chesty loves you!