My son's little suitcase looked just like someone else's because when we got home we ended up with their suitcase and they ended up with ours. Neither suitcase has identifying info in it, other than his suitcase has a new "non-checked" green tag on it just in case it wouldn't fit overhead (it was a small flight).

I'm unsure whether to call TSA lost and found, the airline or the airport. This was at SLC last night, final stop flight, so the owners of the case are likely in Utah somewhere. I'd love to meet up and get the suitcases swapped, and I'm sure they would too.