Is the commission I will receive for exchanging foreign currency for Egyptian pounds permissible, knowing that the source of this money might be from trading Pharaonic antiquities and their statues?

It is permissible to take a commission for work if it is known. As for the doubt that foreign money might be sourced from the trade of Pharaonic antiquities, it does not affect permissibility as long as it remains mere doubt, because the default assumption for a Muslim's wealth is lawfulness. If it is known that a person has unlawfully acquired mixed wealth, dealing with him is not forbidden except in the specific unlawful portion of the wealth. As for what is not known about its status, there is a [tanzīhī] disliking (makrooh) for it.