That is so terrible... I am sorry to hear about it. Even locked things get stolen.
I will take my saddle with me home because yeah the cost is something I don't want to have to spend again but mostly because getting a saddle that fits me and the horse are something difficult to replace.
Live in the sunshine.
Swim in the sea.
Drink the wild air.
Yep... unless my giant, behemoth tack trunk is coming with to shows with me (which it probably won't, my trainer/the grooms steadfastly refuse to lift the heavy sucker) my saddle is coming home with me every night at horse shows.
In the early 90's Region 16 Arabians, had a big presentation on a Saturday night so everyone was in the arena. The ground crew knew that, went through with bolt cutters and emptied many of the big barns tack rooms. It was a huge huge debacle. So even locking sometimes just doesn't stop them.
I never leave saddles at shows or the barn. There have been too many incidents, especially here in California, with saddles being stolen. It is kind of a pain to haul around the saddle, but I would be crushed if it was stolen.
It's exactly why ALL my stuff comes home/hotel with me, EVERY TIME, even when I'm by myself and have to lift my box in/out my lifted truck and again in/out if at hotel. I'm paranoid enough about leaving my horse in a facility, at least I can do something about my tack which I don't want to have to replace.
We have locked things in the horse trailer before (not the dressing area of the trailer, those can be broken into really easily, but the actual horse portion of the trailer, that you can secure with padlocks), when we did not think it was possible to fully secure a tack stall.
Riding a horse is not a gentle hobby, to be picked up and laid down like a game of solitaire. It is a grand passion.... ~ Emerson