We have a similar problem with our property.

The gentleman whp purchased the property adjacent to the property we hunt let us know he was going to post them this summer.

A couple weeks after he posted them, we decide to take a hike along the property line and see if any of the new fences were down.

We come across his signs about 75 yards inside the property we hunt.

Called the gentleman up, let him know what the deal was and he posted new signs, but left the ones inside our property on the trees.

Go figure.