One more point- I don’t think people actually sell their pots and pans to the goy- only the chometz on them- if they did, they would have to toivel all the pots and pans after they buy them back, no?
I know we do it, but I never really understood it. Assuming the pots are clean, no real chometz on them, and cabinets were washed down from crumbs. All that would be left would be a taam of chometz on the pots themselves, but would that count to be sold? Anyway we do biur chometz, and nullify anything left. So what exactly are we selling to the goy when we sell our pots/pans/kitchen cabinets?