Hi and welcome,
On my last B-Max I 'nudged' the cover off the passenger door mirror against the garage. I went to the Dealers and the mechanic just pressed it back into place as only one clip was broken. His view was that as long as only one of the clips on the body was broken it was no problem; but if more were snapped, then there would be repeated problems and it might fall off on the move.
It lasted another 12 months, till I sold it, without any problem, so it appears he was correct.
Geri