Benvenuto Julian e fantastica Ferrari !
About the Italian market, well, it is no worse than other markets.
The only half rip-off I had in buying vintage Alfas was with an American and I avoided a couple of others from Dutch sellers, so... Of course you have to keep your eyes open and check everything. Northern Italy is a little better than Southern Italy, but again, the most (in)famous seller of vintage rip-offs is based in Lombardy.
It is true that the culture to have everything related to a car well documented is rarer than in other Countries, but it is not unknown. My 550 story was well documented and I had the opportunity to check everything I wanted. If you look hard enough, you will find the same level of details you can find in Germany or UK.
'99 550 Maranello
Vintage Alfa Romeo: '53 1900 saloon, '59 2000 Spider Touring, '61 Giulietta Sprint, '64 2600 Sprint, '72 Montreal, '72 Giulia Super 1300 'Polizia'
Bikes: '02 Ducati ST4s, '03 Kawasaki Z.1000