Iphone rubato in Italia - Italy Stolen Iphone! is there a list of stolen phones on the apple site where I can enter the serial number of my stolen iphone?

Italy stolen iphone! I'm located in Italy. I blocked the telephone company number and I reported to the authorities. I'm deciding whether to block the IMEI code. I state that I had not activated any type of lock and I had not activated FindMe... There are procedures to do on the apple site? There is a database of stolen phones? if the person who took the phone format it and then re-inserts a new SIM card and download an application, Apple can 'see this and report it to the owner of the stolen phone registered on the site? should quickly lock the imei, or wait until the thief uses the phone? If the code is blocked imei, the phone does not track down anyone again? thanks, Marco