I think you are underestimating how hard the primer needs to be “poked” to go off. It’s metal that has to be deformed, and when firing the gun’s hammer strikes the primer HARD. You shouldn’t be shaking and agitating ammo boxes anyways, and nothing short of dropping an ammo box from significant height would generate enough force to set off a primer, even if a bullet tip happened to be lined up with a primer just right.
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