Yeah, that's not the problem, they won't try to
seize assets outside of Italy unless it's in the millions. The problem is that if you want to go back to Italy and live there, they'll seize your wage, property, etc. A person I know (in
Spain) has had his income from renting a property taken away because of just a 1500 Eur debt to the taxman.
So, if
@ilpablo doesn't think he'll ever touch Italy again, not declaring it should be fine, however, there's a risk of them seizing your assets (if you stay in Europe) if they get cocky and if you ever want to go back to Italy they'll 100% get their money back.