frinklabs: Checked GZ today, and found (and removed) the LnL tab, with no other sign of the container.
The stump is now shielding a gopher hole so it is possible the rodent has taken the container into its den.
I won't replace the container at this spot (to avoid disturbing the gophers) but I was speaking with the facilities people and they're planning a rebuild of the spectator area and would entertain incorporating a built-in geocache hiding spot.
Fun!