Interestingly enough.....in Jason Goes to Hell (the movie that ends with what appears to be Freddie Krueger's glove grabbing Jason's mask at the end....which spawned JvF), there is a book that looks a LOT like the Necronomicon from ED2 and AoD in the Vorhees house, towards the end of thr movie. There is a dagger/sceptre type of thing that they also use that is very similar to the one in ED2.

So it seems that this has been in the works for years.

Rmour has it that the puzzle box from Hellraiser is also in the house, but I haven't seen it.