Quote Originally Posted by davsel View Post
PVC tube - Fill with motor oil

Decoy can not likely to work. I suspect anyone with a detector simply needs to go back over the hole after pulling out the decoy to see if that is all that is in that spot.

Bury next to a metal fence post or along side a metal utility pipe/well pipe/ground rod, or deeply buried/tangled rebar - anything that is difficult to remove. This prevents removing the decoy and rechecking the spot.

Ammo in sealed container with oxygen absorbing packet.
some SA 5.56 battle packs, older Russian, not wolf or tula in the original packaging and last but not least old reliable spam cans