In your first post you list it as HR32? as in gts-t chassis not GT-R chassis? GT-R would be BNR32.
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rust in door well - V Bad not impossible to fix and not terminal.. try and get a photo. Certainly not something you would expect in a 20k GT-R?
degassed air con - All imports must be degassed as part of compliance, unfortunately it usually happens overseas in all the wrong ways.
sump plug (need to check it's there now) - The workshop may have simply been changing the oil? However if it was run with no oil even if sump plug is there now, running the gearbox with no oil is V Bad.
bubbling in rear window tint - Normal, get a new tint.
weird non standard wing - Has a standard wing with a lip as well?
missing badges - Normal
japanese head unit doesn't receive local frequency radio - Normal