I grew up near a Navy Base in the desert. This kind of stuff turns up, ocasionally.It was considered an extremely bad idea to mess with any of it.
When you play around with old, rusty bombs, sooner or later, you'll be blown up. So, don't do it.
I remember looking at an old National Geographic in which the author (reporter?) went to France to write about all the tons of rusty, leftover munitions from WWI. Yes, WWI. Farmers are periodically blown up as they plow their fields, cause they hit some old "dud" round. It is so commonplace, that the farmers just stack up the old rusty artillery rounds on the edge of their fields, and Bomb Disposal trucks it away. All this is done with absolutely NO Fanfare, to keep tourists ignorant and happy. Rusty 75mm "French" ammo looks like old rusted cans of hairspray.
They take the poison gas shells out to the coast and burn the stuff up, evironmentalists be damned.
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"You'll be sssooooooorrrrrrrrrryyyyyyyyyy!"