This is one of the most common sources of confusion for families trying to send books and the inconsistency you experienced is real. Here is exactly why it happens.
Correctional facilities require that books be sent directly from the publisher or an approved retailer. The reasoning is straightforward — a book coming directly from a verified source is far less likely to contain contraband than one that has passed through unknown hands.
Amazon operates in two completely different ways depending on which you use. When you purchase a book and Amazon itself is the seller and ships the item directly from their warehouse, that qualifies as an approved retailer shipment. The book arrives in Amazon packaging from Amazon's fulfillment center and most facilities accept it.
The problem occurs when you purchase through Amazon's marketplace and a third party seller fulfills the order. Even though you are buying on Amazon's website the book is actually coming from an independent seller who may be storing and shipping it from anywhere. Facilities do not consider this a publisher or approved retailer shipment and will reject it.
The first book was likely fulfilled directly by Amazon. The second was almost certainly fulfilled by a third party marketplace seller. Same website, completely different outcome.
To avoid this going forward always check the seller information before completing your Amazon purchase. On the product page look for the line that says "Sold by" and "Fulfilled by." Both must say Amazon. If either shows a third party seller name the book will likely be rejected at the facility.
InmateAid's book service sends books directly through approved channels so you never have to worry about the seller distinction. If you want to avoid the Amazon marketplace confusion entirely ordering through InmateAid is the simplest solution.
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