Today I spotted this 400i on the Interclassics. It was sold already. It had a very particular color combo, light green-ish with a dark green interior.
I did a quick on the register and easily found it:
From this I was able to recover the license plate and learned it was originally delivered in the Netherlands in 1981 and sold to the 2nd owner at 1996. And now it's onto the 3rd owner.