The normal channel we use for bike authentication in Bologne will probably not work for your SP.2 due to a database system change that happened 10 years ago or so. There was some glitch and apparently, their system no longer retains infos about 851/888 SP/SPS. When the previous owner of my bike requested a Certificate of Conformity from Ducati West Europe to import the bike from Germany into France, they came up with a « This frame number never existed » type answer… 😅
You’re best luck is to contact the Ducati museum in Bologne were someone (the director, I guess) still has this info. I attached a copy of this email exchange below, that will allow you to understand it all

