Check POS wallet on coinexchange. If you are a trader on coinexchange, you will know CE had opened the wallet for for almost 3months now. No matter how hard one try to withdraw, the transaction will be a fail tx.
To back the accusation, here is the link
https://etherscan.io/token/0xee609fe292128cad03b786dbb9bc2634ccdbe7fc?a=0x4b01721f0244e7c5b5f63c20942850e447f5a5ee. They allow deposits into their address but you will never see their address sending out. They have minted almost 14k POS. I think letting a unit of pos out of their address will reset the coinage to zero. Could this be a wrong assertion ?
Development of the Postoken internal or decentralized exchange just like Accelerator token did would have solved this problem but I don't think that will ever be possible with the dev abandoned the project.