How to identify MDT Plymoth with new can motor?

[Bloks]

Maybe someone can help me - i want buy MDT Plymouth with new, silent motor new, silent motor, but not understand how to found them.
Trader say - "You need found 5-digit identificator". I see in  Bachmann store - five MDT Plymouth with different numbers (one o them i now have, but no success - old noisy motor inside).
How to identify MDT Plymoth with new can motor?

[Franz T]

Bachmann does not change model number as they update the product. So the model number for the new one would be the same as the number for the old one you have. The new (silent motor) version has been out for quite a few years now; so ANY of those 5 different numbers would be for a locomotive with the new motor

[Bloks]

Well said but the reality is different - few days ago i received from Bachmann ebay dealer MDT Plymouth with old-fashion motor ... Now i seek how to get MDT Plymouth with new engine.

[Franz T]

eBay is NOT Bachmann. When you buy  from eBay, you take you chances and more often than not, you get screwed. You need to file a claim with eBay and PayPal.
You need to buy from Bachmann directly or from a reputable Hobby Dealer.
Are you located in the US?