The bonnet closes on two catches. If you don't drop the bonnet hard enough it doesn't close properly, normally on one side.
Yes, that’s obviously a possibility - but the cynic in me is suspicious as it’s had paint on the front end and the N/S front wing, so a bit of a coincidence that it’s on that side.
That coupled with the fact that the OP doesn’t seem impressed with the paint match/finish, the missing badges/filler etc and that there’s no photos of the engine bay (you’d also expect someone who works for Mercedes to know how to close a bonnet and if not to spot it in the photos?)
Could be nothing but I’d be over it with a fine toothed comb, approved used or not (remember the recent thread for the AU 212 cabriolet?)