Seller using non-licensed electrician

[Kevin Gallagher]

I have a single family rental under contract. During the inspection period, I had an electrician look at the home because it has aluminum wiring. He said it wasn't up to code and potentially hazardous due to improper connections so we wrote and addendum to the contract requiring a LICENSED electrician to inspect and make repairs to all outlets, switches, and fixtures and the Seller to provide proof of work prior to closing. They sent over a receipt last night for an electrical company that seems to have been out of business since 2014 and neither of the individuals to whom the LLC was registered are currently licensed electricians in my state. The Seller is saying that he's fulfilled the obligation but it's clear to me at least that he hasn't provided enough info to prove he has had a licensed professional perform the work. Looking for a little guidance on how you guys would handle this situation going forward and what my options are.