As for your barrel ... if I wanted to hide something metallic, I would dig a deep hole, bury it, partially fill with dirt, then plop a barrel on top and finish burying. Even with a metal detector, you'd only find the barrel, not the other thing ... and you might not look under the barrel.
You are a twisted mind, Miss Rose..... You guys are gonna make me dig that thing up and call in the forensics people ain't ya? ;~D