I think the tree trunks have gradually grown together more because there is no way that anything would stay in there now. Even a pouch would fall out with a strong wind. However if someone is driving by this rest stop and wants to leave something behind on the completely opposite end at the edge of a field is a very nice multi-turned tree. Hint hint...

Good clues but the box is missing

I looked all over with no luck.

The ants love this box :/