Huh, a crate spawn, never gotten that before. I was walking through the wilderness when I entered an open field with a road and the crates were just there beside it. I left my crowbar at home, so I did the 20 minute walk back to base to grab one, came back and popped open the crates. One had a few pairs of army pants, a kevlar vest and a helmet. I had all this, so I moved on. The next one had some MREs, water I believe, a smoke bomb and antibiotics. Better, better, you can never have too many MREs! But the last crate was PACKED with explosives. 7 sticks of dynamite, 3 grenades, 3 more smoke bombs, an EMP grenade, 3 teargas canisters, 4 flashbangs and 2 blocks of C4. Great stuff.
After dumping the ordnance back at my sewage treatment plant (note to self: magical hole in the wall appeared on the other side of the sewage stream, investigate later), I walked back on a slightly different path and found a trap field. I walk into it, avoiding what I can see... And step on a mine. Minor damage to all parts, heavy pain. I reach the center of the field and found a few cans of food and some water, then I "disarmed" some spike boards, not taking my chances with the shotguns after the landmine incident, and walked back home. Not worth stepping on a landmine for, but it was still a decent haul.
EDIT: Hey look, a second crate spawn. First crate has 2 grenades, 2 teargas canisters, 3 C4 explosives, 4 dynamite, a flashbang and a smokebomb.