There's a hard key slot located behind the keypad, so there's still access to inside.
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So, this will be a round-about update.
Although I don't put Vaseline or anything else on ammo can seals anymore, in the early days of my firearms ownership I treated maybe five or six can seals with petroleum jelly on the advice of a friend.
This past weekend I had a chance to open three of these so-treated ammo cans, and the seals seemed to be as supple and serviceable as they were twenty years ago when the Vaseline was applied.
So, should I call this "myth busted" that Vaseline harms the seal in a military ammo can? I'm thinking it is.
On Vaseline... The right answer is do not use petroleum products on rubber. The amount of time for something bad to happen is clearly beyond 20 years in this case. The ammo can rubber gaskets are likely engineered to be petroleum resistant would be my guess.
On the whole EMP thing... Good God.
A HEMP would shower down lots of electrons that need a home. well grounded boxes would presumably pass those electrons to the earth's magnetic core most efficiently. If the boxes are not grounded, you might actually be creating more risk for electronics inside.
For people who actually follow EMP, there is a new Commission proposed in the National Defense Authorization Act likely to go to the President next month. Hopefully they will get some more serious and realistic science into this commission.