As done in the other related thread, I seize the opportunity to thank Byron for his contribute.
I am enclosing a reduced image of the list where Serg. Sancristoforo is reported as KIA. It is clearly readable the "L.02808" attributed to the German Unit.
It could certainly be a typing error instead of "L.02708", but allow me to still mantain a small percentage of possibility that it could mean something else (eventually a list of codes linked to...?)
At any rate, the typing error is the most logical explaination and the report Byron attached seems to give no space to the presence of Italian pilots (or, at least, did ignore that).