Rocks on teach & learn were missing. I found the little tin in the dirt. Stamp was safe but tin was rusty & hard to open. I put the stamp in a baggy and a small gray fake rock. Placed it up the little hill on the tunnel side of a large 3 foot long very red rock. In a SPOR.

3 was right where you said.
1 was missing- I checked all the guard rails on both sides of the tunnel.

I attempted these today. The first box is no where in any of the four possible guardrails, we looked in all of them. The second box...there was a huge avalanche this spring and the debris is everywhere....we dug through where the SPOR should have been, to no avail. The third box we did not attempt....so cannot be sure. :(