I totally agree with Leper.
Same thing applies to the plastic bags for liquids in the same airport, if they're not theirs, they just drop them in the bin.
After waiting in line for nearly two hours the last time I was there, they threw away my lenses case. Of course, they gave me the option to go back to the end of the line after buying their stuff, or go, pay for the bag and then pay for the express lane. All in a very rude tone.
All the hassle for a contact lenses case in a regular sandwich zipper bag... soooooo suspicious and dangerous...
It's just frustrating, really.