ByronForestPreserve: Well, I went out to check the sinkhole, and it's full to the brim of cut trees and branches! I don't think that this spot will be available for at least a few months. Even so, when it's cleaned out, there won't be anything to hide the cache anymore. It's great that the debris and invasive trees are being restored to prairie...but there goes my spot! I'll re-hide this container on another part of the property some time.
I did dig around for the TB but didn't see it.