This could come in handy....

[spyguy]

I picked up an air-tight metal ammo box with a gasket type of clasp on the side for $3 today at a garage sale. I overpaid a little, but times being what they are a man never knows when he might need to put down his own cache of valuables!
HH
-spyguy

 

[Lowbatts]

And another man with a metal detector may come along and....

Keep 'em stored indoors!