I remember when we were all discussing this back at the start of this case. Somewhere I posted about my husband's experiences with construction auctions. My bro-in-law had a contracting business for many years. My husband went to several auctions with him. Those places are huge and full of great deals on used equipment and foreclosed upon materials, tools, etc.
They used to take a lot of cash, thousands and thousands, with them because sometimes one can get a better price by offering all cash, upfront, immediately. And it is quicker overall, to just pay up and go. If you want to drive off with some very expensive equipment, you don't want them to worry about your check, or your account being shady. JMO