Xyrdi: Requesting peer or mediator attention

It came to my attention today that the peer for this trade appears to have sent fiat funds twice by accident. I’d like to return the extra fiat, and thought about starting a new trade with this peer and use the chat function, but there is nothing in the orderbook matching this peer right now.

Unfortunately it no longer seems possible to obtain the mediator address (at least I could not locate this information), so options are even more limited.

Any suggestions how to proceed? I guess I could also ask the bank to simply revert the transaction but it would be reassuring to contact the peer beforehand.

And to clarify: The trade went into mediation (peer had trouble sending the funds and ended up sending from another account) and it’s been successfully resolved for about two weeks already, so the in-chat functionality is out of the question…