Removing the airbox can if you are not aware end up in breaking the rubber mounting bush ( repairs 100% with superglue)
The correct way is to use a 22mm spanner under the airbox bracket to hold the top of the bush .
However once you have it off you can fit a simple bent bit of metal to hold the top to save using the spanner.
Diagram below ..just leave it in place under the bracket and the jobs easy next time.