Sounds like an Auction Hunter episode.
Allen: "Ugh! This stuff is all junk. How much did we pay for this room?"
Ton (digging into a box): Holy Crap! Allen! Allen! I found a lockbox!
*smashes it open*
Ton: Holy Crap! Silver and Gold coins!
Dont stop there.. Cut to the negotiating with a buyer
Allen: "Mr Coinguy, I have $15,000 worth of coins that could be yours for the right price"
Coin Buyer: "Ill offer you $8,000"
Allen: "I said the right price, apparently you don't want this box of coins."
Coin Buyer: "How about $8,500"
Allen: "How about NO, how about $14,500"
Wish they would show a REAL buyer laughing and telling him to get bent. If I was a buyer and the seller was acting like that, I'd have to show them the door. I'm sure it happens but we'll never see it.
Personally, if I bought a locker for $250 and came across a box of coins.. I'd keep em and sell the other crap. I'm a silverbug anyways.. and if I found gold coins, I'd be a gold bug too.