This should clear things up for you to follow along.
This seems to have been lost in the mix.
If the seller didn't agree to sell it to you, ( and give you his paypal information, and take your payment, all earmarks of the elusive and rare "deal").....then why would he send this message to you...
This message to you would/should eliminate doubt as to what the seller was thinking as to whether this was a deal or not.
Can he have a deal if he already sold the book?
Maybe ask the seller. he's the one convinced he's got to make it up to Junk.
Why should we assume that the seller knew he was communicating via PM. He could have taken Ambien and was sleep selling.