Don't fret. MGM is a good man, things will be sorted but they just may take a little time - very disappointing for those waiting for things and very stressful for MGM trying to figure out who has bought what and when and where to send it etc.
Basically his ebay and paypal accounts were hacked and he has no information as to who has bought what, what the invoice numbers are and where to send the goods. Follow his request and send through information to him.
I live in the UK and had my first Ukulele bought for me from MGM who shipped it out more than well packed, with instructions etc no problem and would highly recommend him to anyone.
It was a sad day for the Uke world when he realised he had no choice but to close his business due to ill health - his business hasn't collapsed, this is a choice he has reluctantly made and all who have bought from him or know him have not even the slightest of doubts that all orders will be fulfilled. As hard as it is for you right now, please bear with him whilst he sorts out this mess and regains control.
I have no words strong enough to describe my feelings about hackers.