You should state explicitly which modem it has. We can make assumptions but …
Ultimately the market decides whether it is correctly priced.
Some complications though: Presumably if someone in Greece bought a new phone today (i.e. joined the queue) then import duty would be charged i.e. import duty is in common between the two scenarios - new or used. Worse still, the import duty for a new phone would presumably be calculated on a much higher “new” price.
On the other hand: SIM & SD Card Tray Issue! You never quite know what you are getting when you buy a used phone, and the warranty support is murkier.