mate, quite often when you book a car in to a dealer you speak to the head service guy or similar behind the front desk. he then takes the job card out and gives it to the 16yr old apprentice they put on yesterday who hasn't ever had grease under his nails. its for this reason that most people i know will check all work done on pickup or soon after to make sure there are no obvious stuff ups.
in your case not only would i check the airbox but i'd also check IN the airbox to make sure the filter in there is actually a new one. wouldn't be the first time a oldie has been re used.
i do believe mr efv8fairmont, that in your last post you sort of contradicted yourself anyway saying you should trust them because you pay them $75/hr and then go on to call them muppets and you wish the car wasn't under warranty so that you could do it yourself.
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