[Senior Patek Moderator]
I (obviously) don't know more than what I can read online about this theft....the "Gazzetta" is a very reputable (sports) Italian paper, but I guess an exact estimate isn't easy regardless, given that this RM (reportedly, a ref. 67-02) is bespoke.
It appears from the Gazzetta article that this was notoriously not a good area of the town, where residents had already complained about safety at night. Again according to the newspaper, the pilot initially did not realize he was robbed --- which fortunately seems to imply he's unharmed.
For sure, I agree with you that whoever stole this watch (some "youngster" who mixed up with the fans, it appears) won't be able to easily resell it! ;-)