With the recent (3-4 weeks ago) find of a Curtiss Helldiver in an Oregon forest not far from its base, you have to wonder about the planes that haven’t been found yet.
There are huge tracts of wilderness in North America, I’m sure we’d be surprised what’s out there.
On the WIX board there is a posting about the discovery of a B-47 that crashed in remote Wisconsin in the early 60s.