Sounds like this is a job for a detectorist.

[mikeraydj]

Saw this story today. Just another example of how we can be an asset.

AOL.com Article - Classmates can't find 38-year-old time capsule

 

[CincinnatiKid]

Time capsule may be to deep for a detector after 38 yrs? A "blanket" GPR search might help. Hope they locate it...
Peace