I think you may have been a bit hasty in filing a dispute, which sometimes can %$#& the other party off. I know that Thomas has been busy lately and I believe he still travels between the West Coast and N.Y. fairly often. His work has recently forced him to cancel some other things that he had planned.
I know that you are probably anxious to receive your drive, or a refund, but for most sellers, eBay is a minor, secondary occurrence in their lives and sometimes other matters take a higher priority.
Having dealt with Thomas in the past on several purchases, I would guess that this is the case and that you will eventually get your drive, or your money back. It may be delayed more by your actions and negative remarks left here.
I don't condone such behavior, and don't know if that is happening, or will happen, but know that some individuals use such behavior to retaliate when disagreements occur.
I hope that it will all be worked out soon for your sake and things can be patched up between Amiga users.
Good luck, try to communicate directly and not here, and exercise as much patience as you can force from yourself.