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HowieI see the auction house blanket LOA as a single use document between the auction house and the buyer. The auction house describes the group and obtains a letter from a 3rd party stating that the auction house description is accurate. The buyer gets the group and then sells the items using his own reputation as a seller. He can offer a copy of the LOA and hope the people believe that the item they're buying did come from that big Mastro lot. He can offer his reputation as a seller and provide his own LOA and back his product. Or he can obtain a 3rd party LOA that people who know him may not need, but it could enhance the value to people who aren't familiar with his reputation.