Andy Warhol’s print of a nickel coin was expected to sell for as much as $30,000 in a money-themed online auction on Paddle8.com. Instead, the 1986 work failed to draw a single bid, the biggest casualty of the “Currency” sale in which 65 percent of the 20 lots went unsold.

None of this information can be gleaned now. When the auction ended at 5 p.m. on July 24, the estimates and final bids vanished from the site. So much for transparency.