Same here, I do not understand what he's talking about.
I feel you have been cheated by your boss and also his clients? correct? Since you have contacted your boss but he did not reply, if like this I find it difficult for you to get back what you have lost, because even if you can hack his wallet, maybe your bitcoin has been converted by him.
It's rather simple. He (she) was hired online to do a "work" which is basically about receiving banking transfers and forwarding them for a small percent as "salary". In this case he was required to convert received cash to BTC and then forward it. So when the fraudulent transfer is discovered by the bank and they request funds to be returned the money is already gone. OP was hoping to be able to revoke BTC transfer he made, which is obviously impossible.