From memory the top hinge is the smaller one and could have a pin like that, but it does look small in the photo. If it is from the hinge assembly it'll be obvious, but be careful as the door could drop. The top hinge pin has a grub screw.
I'd expect the pin to be pushed in from the top so even if it were to come loose it could never fall out, but that might not be the case.
Also worth checking the glove box hinge?
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1996 A8 4.2 QS. Bose, Solar roof, um...um... rally sport towbar. Now gone to a new home as the Traders 8.
Bright yellow bus o love.
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