 The most valuable and highly prized first and second state 'butcher covers' are those that were never opened and remain still sealed in their original shrink-wrap.Since the first documented collector's sale of a mono 'butcher cover' LP in 1974, which fetched US$457.00, the value of first state mono versions has consistently appreciated, reaching $20,000 in 2006.In 1987, Alan Livingston released for sale 24 "first state" butcher covers from his private collection.