Hope it works out for you and he keeps his promise .
A while ago i posted about the milodon pickup tube that was rusty inside ( both of them) but it fell on deaf ears , so would be an idea to check that out aswell.
Ya it was a used pickup so it got a very good cleaning. It look fine. I usually leave old oil pans and pickups dirty, at least on the inside till they are put into use again. Gotta love that oily protection.