I have heard about this scenario happening to some of the users here and it is quite rare and in the end it get resolved but it takes time. So push the domain only when the escrow.com gives you the instruction. You can provide proofs for successful push if any dispute arises and also they are well connected with most of the popular registrars so they can contact them. Nowadays If possible I stay away from escrow.com because they are very very slow wrt competition. I would recommend you to use undeveloped.com for smooth and quick transaction.