I have done some MDing around Marienville, Elk/Forest County, I have a camp in the area. I have found it difficult to find good hunting places around that area since it was sparsely populated back in the day and it seems as though anything older is still in use. It may also have something to do with research, I seem to find much more in the way of spots around here in Pittsburgh. Yeh, if I wanted to hunt parks for modern stuff I could probably do that, but I got away from that years ago. I would much rather search an old homesite than a park. I probably need to talk to you to find the good spots!
Recently I got permission to hunt the old abandoned church off of 899 outside of Marienville. I hunted it good and hard about three times, what a disappointment, not much to be found. Because I'm not from the area I kind of focused around rt 899, I did however find one hotspot a few years ago that turned up some good treasure.