Yep, that is totally normal. Nice isnt it. It will be an access panel to the ECU or the like!
A tin of satin black is called for here I feel!
If your buying used check the interior trim for peeling.
Mine went on the Glove box, fog light switches, knee roll and a few other bits.
It will get replaced under Trident warranty.
Other things to look out for are the brakes, make sure they are 100%, take it up over the tonne and press hard and soft so see if there is any brake judder.
Also check for worn half shaft splines.
Reverse hard, then go forward and listen for a 'Chinque' coming from the back axle.
Then the usual stuff, tyres (£1200), clutch (£2k+), brakes (£3k all round)
Stone chips and check the paint on the boot lid in strong light. Being plastic, the paint seems to mark, swirl and scratch and suffers from bird lime stains.