Nope. Wrong answer. I wanted to do this until it was revealed to me, if they (us) find a buried container in one place, they'll start digging at the 1st one they can't find on someone elses property. I know, that I check fence post caps when I'm in a cemetary because I've found quite a few this way.
If it's only partially buried (35% to 50%) as the OP suggested, then how would finding such a cache make people start digging at the 1st one they can't find on someone else's property?
If anything it might make someone think they can bury one when they hide it. But then that should not get approved unless they own the property or get explicit written permission to hide one in such a manner.
Thanks for all of your opinions! Wow, I'm glad I asked.