Put me in the not seeing anything wrong there.... the only foreign substance I am seeing is the silicon used to glue the caps.
That amp is also not that rare / sought after / high value enough to deal with that much crap, look for another buyer. It sounds like he's just looking for reasons to...
I believe it was this
https://www.amazon.com/dp/B00CY1N7US?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_1
but for a Scumback I'd email Jim and see what he recommends
For me it was just going in an open back combo so not sealed so it was making sure it didn't rattle and was cushioned a bit
Call it what you want, dude seemed like an asshole and I don't spend money with people who seem like they would be a problem if issues come up with a purchase. For cables and crap who cares, for a couple grand amp? You do you but I'll pass and deal with somebody I know I won't have to fight with...
Ah yeah, I remember him throwing a temper tantrum when Mike sold Soldano because he was going to have to operate under a normal dealer agreement like everybody else instead of getting the good old boy discount because he knew Mike and then price gouged on his remaining Soldano inventory. Didn't...