Not that this will help the immediate matter, I do not know both sides, and do hope you are able to negotiate the return of funds for the shipping contract, but here is a small piece of advice in regards to purchasing machines from ANY source from a seasoned buyer.
Once an agreement is reached, and before ANY money is secured or placed in escrow, a full bill of sale of invoice should be generated.
There was no mention of this aspect.
A "deal" is not a handshake in today's world, and nothing should be assumed.
Escrow funds transfer is not an invoice bill of sale.
"No contract invoice bill of sale = no deal"
Anybody that believes otherwise, is not an informed consumer.
This protects the buyer as well as the seller, and can be used in any court of law as a binding contract as evidence.
It makes sellers think twice about business practices, even if under a private sale.
This also makes buyers equally responsible.
Another side effect is there can be no arguments for "buyers/sellers remorse" problems, which happens more than people can possibly realize.
I have had to use this leverage several times during my collecting career.
I have had sellers want to buy their own game BACK, "just because", even after the game was purchased, deal completed, cash received, removed and relocated.
Invoice was hand, and I stated, politely, no.
"Do not weld the pinball sales invoice as sword, but as a shield."