Buying an 83 930, need VIN location advice

[Crazy Horse]

Hey group,

I am looking to buy a 1983 930 and want to make sure everything is a go. The cars usually, as we all know, have someone along the line of ownership that likes to do some kind of mods.

I am aware of the number forward of the A/C locker in the trunk and the lower driver's side door sill (sticker)

Where should I look for the others? I have also read a forum post that mentions a "hidden" location.

I want to make sure I am doing my due diligence.

I would appreciate any help that anyone may give me.