I had broken 2 (out of 6, I think) clips on the air filter box of my now-gone 1997 E420 (M119?). I meant to buy a junkyard replacement box but never got around to it. I probably ran it for 60,000 miles or so and none of the other clips ever broke. My recollection is that it was difficult to get the box apart, and that I probably broke the clips through my own clumsiness. I think you should just keep an eye on it, and don't assume that the others are going to fail.

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1996 C280 289K Traded
1997 E420 167K Traded
2001 S430 240K Traded
2010 E550 4matic 80K
2000 GMC Jimmy 198K Gone to Boneyard
2003 Camry LE 196K
2011 Mazda3 i Sport 31K