Buyer Confusion on Nancy Drew #12

Oftentimes, sellers state that a book is the first printing/first edition according to Farah's Guide, but they do not give the points that make the book the first printing/first edition. Buyers should always be cautious when a seller states that a book is the first, even by Farah's Guide, but gives no additional information. It is also very important that sellers state which edition of Farah's Guide is referenced in a listing. Farah states in each edition of his guide that sellers should mention which edition of Farah's Guide is used to describe a book that is for sale.

This brings me to this listing:

NANCY DREW # 56 Thirteenth Pearl FIRST EDITION Item #350090402841

The only information given by the seller is, "This is a First Edition according to Farah's Guide." Aside from the fact that "first edition" does not mean "first printing," more information is needed. Which edition of Farah's Guide did the seller use? In older editions of Farah's Guide, the first printing of Thirteenth Pearl is said to be a book with the next book notice of The Triple Hoax. Farah's 12th edition states that the first printing has the next book notice of The Triple Hoax in plain text while the second printing has the next book notice in italics.

Which is it in this case? The seller might be selling the true first printing according to Farah's 12th edition. On the other hand, the seller might have the second printing up for sale but used an older guide which labeled the second printing as the first printing. The seller is not necessarily misleading buyers, but the end result is the possibility that the buyer could end up purchasing a second printing book with the mistaken belief that it is the first printing book. I have no idea in this case whether the seller sold the first or second printing. It is up to the prospective buyer to make certain before bidding.

I have noticed several instances recently of sellers who cite Farah's Guide and state that their listings of Thirteenth Pearl are the first printing but give no additional information. I have to wonder whether some of these people might be purposely misleading buyers. I cannot understand why some sellers state that a book is a first by Farah's Guide but do not back up the claim with the hard evidence.