If in the past the signs were just left within mud lake park then maybe it was a land issue, but the signs were left with in that area of the west end, not just within that park. I don't think it is a 'this is my land issue' but someone who has a different issue. I do find odd they do not contact the cache owners ( I assume contact info in the container), post on line, find us, but rather LAMINATE a sign and leave that in the woods. I think they have found them by chance (odd I know)
Once when finding a geocache in the mud lake are I came across a paper with something like, meet at 6pm 3rd lamp post upper Carlingwood car park in what I thought was a kids hand writting, so who knows.
Maybe it is a drug dealer who wants the geocaching gang off his turf?

I wonder if this person is even aware of what geocaching is, or just finds and lumps it in to the BAD activity group like gangs and drugs.