Anyone know anything about collector's item?

Or lack there of, what I have questions over are a few items I have obtained over the years. We used to go to Crandon for the off road world championships and have a few autographed trophy truck parts. I am not sure of the rarity of the items or if there is any value. They are cool for the man cave but the wife thinks they need to go. I have a rear quarter panel autographed Keegan Kincaid #7 and a door autographed by Matt Cook #55.

If I can prove there is some worth to it I can keep them.

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