It does happen pretty easily if the bolts holding the air filters in place are over tightened. I would say your options are:
1) Buy a used air box from someone on here or on eBay for a LOT cheaper and replace it yourself
2) Buy a new one from some place like Ron Ayers or Partzilla and replace it yourself
3) Pay the dealer
4) Try to rig something maybe with JB Weld to hold the nut in place so it doesn't spin when tightening the bolt
5) Do an ear shave
In order of cheapest to most expensive: 4, 1, 2, 5, 3.
In order of easiest to do (assuming you have the money): 3, 2, 1, 4, 5.
Here is a link to the parts diagram at Ron Ayers: Click me
Basically what is happening is that the bolt (p/n 92002) has caused the plastic "tube" on p/n 11011A to crack because it was over tightened so the nut that is up inside that tube just spins freely. If you can JB Weld or otherwise glue that nut into place, it should fix the problem assuming the tube isn't completely split in two.