Theres some Eb soprano clarinets for amazing prices on Ebay. The seller has no feedback and the descriptions of the instruments are taken off the offiial websites for the model of clarinet. Is there any other way i can check whether these are real instruments not models or any other cheat, and would any one else buy one in a situation like this??

Avoid for sure- never buy something that expensive from a seller with no feedback. Always ask questions and use your head. Request a trial period and go through escrow if you really want to play it safe.

Ask for credentials or a repairman`s certified documentation of item.