An update...
Hi ********** Catalin,
Hi there. Sorry for the delay. It appears, on the Ethererum blockchain, that ETH funds were sent from an account that reported a compromise and that shortly after some funds were deposited to your Poloniex account from the wallet the compromised account withdrew to. IP evidence as well as the blockchain transaction point to your account as the "compromiser" and recipient of the funds, which has been the issue all along. I am not sure what else we can do to move forward with this case... if you can present evidence to the contrary it would be welcome and I will do my best to investigate further.