Firstly, I'd want to view and inspect and verify the condition of the kit before buying. That's just due diligence.
Vans may be able to confirm the identity of the original purchaser.
Paul vS (yes I'm also a Van)
Building RV-6A #22320 O-320 FP. Wings and tail complete, working on fuselage
Flying my Aeroprakt A-22 STOL and the aero club's RV-9A while I build