Never hear of Del Reeves. Case is all closed off to vehicles. Pretty much anything in the Bolton, MAnchester, Glastonbury area is closed off to vehicles. There is a place in Ellington (short but fun) you can still access and up in Union.Chocolyle, can you still run through Case Mountain or any of the Nike Sites? What about Del Reeves (just not after dark)? Not that any of those would be challenging. Looks like everything else has been developed.
Have you reached out to any mountain bikers? They usually know some good hidden stuff.