Remember this blog: http://erwin400.blogspot.nl/2014/10/ferrari-400-neiman-key-reserve.html
Well, On the keychain there is another key, the one for the glove compartment:
So, I had to get a spare for that one too. Turns out it's a different brand: Torino / S.A.F.E.
I found this link but they had none on stock:
And also on Ebay I found a few but mostly for ridiculous prices. Except for one, a blank Original key was listed in Germany for € 7,- including free international shipping. And it arrived today
So now I need to find a locksmith who can make a duplicate. Another step closer to completeness.