Why are the log book and other records being sold separately?
When you buy an aircraft or component, the records form an integrated part or the item is effectively worthless.
I think the price is somewhat over inflated as there is no operational use for this. If the seller takes some zeros off the end there might be some interest.
Maybe someone looking for an engine for a land speed record attempt might be interested but no museum would stump up this much.
Just my thoughts.