Lee Rosenbaum mentions today that "auction sellers who were issued coupons, now redeemable for cash, in connection with Sotheby's and Christie's 2001 antitrust settlement, had better stop procrastinating. Some $45.4 million in coupons ($22.7 million at each auction house) are still outstanding, and they will become worthless pieces of paper on May 15."
She also has more on the increasing use of guarantees at Sotheby's over the last three years.