Like rhino said above, in all likelyhood the label on the bag was most likely ripped (or it wouldn't be lost in the first place). And trying to describe a bag is... challenging.
That seems like a business decision to use poor labeling and likely negligent,
They should be required to show some good faith effort that their labelling system is design to be reliable instead of the cheapest possible, and also show they have made a good faith effort to return the mound of lost bags.
They should be required to show some good faith effort that their labelling system is design to be reliable instead of the cheapest possible, and also show they have made a good faith effort to return the mound of lost bags.