Kind of off thread, by simular:
I needed a sankey keg and spotted one at the local metal recycler while there on other business. I purchased the keg from the recycler at scrap stainless per pound price, and have a receipt for the purchase. The keg is stamped wiith a mega-brewery's name. When I got it home it still had the spear installed, a CO2 charge on it, and some stale dregs left in it.
I've felt good about it since I paid and got a receipt. But, now since I've read this thread I'm wondering if it is really my keg.