Had a good signal over a concrete slab in the woods. My gut said it was a coin so I went back with the old sledge hammer and rescued Abe from his concrete tomb. The coin was in the concrete. Lol. It is a 1926 nothing special but the scenario makes it worth posting.
I registered several real strong signals underneath an asphalt driveway back a year or two ago, but the owners were understandably reluctant to let me start punching holes in their nice pretty driveway. The targets are still there in all likelihood. Good job getting your target out.