The same principle holds in Egypt: if you discover anything interesting while digging, you have to report it to the Department of Antiquities. They may take over the site and do a dig, or whatever they see fit.
This is why I know people, from Alexandria, who found Roman era amphorae while digging the foundation of their apartment building just take them home and never tell the authorities.
I myself have seen Roman earthenware come out on a government owned building when digging for a data center power cable. The managers just said keep quiet, otherwise it will delay our own project.
The stuff is not even sold or goes on the black market, it sits in storage at someone's balcony or dumped as rubbish.