I had a bunch of these in my GFC box and just wanted to make sure that I'm classifying them correctly. If I'm wrong how should I classify them

The two are backplane for sure.

The single board would be similar to a slot processor or apple CPU if the chip was there, which is quite a price range... I'm not sure where it should go but would guess towards backplane as well.

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I have a hard time with marked141's answer. I personally would think that these would go in GFC. If they are only going to pay you backplane prices for them, I would absolutely trim the fingers! I understand why marked said what he said, I just don't agree with it. These are clean boards (no junk) with nice fingers on them, i.e. GFC. The "slot processor" card is less straight forward due to all those caps on it. I would wait for an opinion from someone like lost (not saying that marked doesn't know his stuff" as he surely does. Good luck my friend.