Qatar air lost my bf's carry-on luggage

My bf took a flight to Doha yesterday. Because he was one of the last people to abroad the plane and it was all packed on the plane, one flight attendance asked him to surrender his carry-on luggage and gave him a tag. He arrived in Doha a few hours ago, waiting by the plane when he got off and there was no sign of his luggage. I don't know how Qatar air lost someone's luggage in this type of situation. I hope that Qatar air staff proceed my bf's luggage properly and I hope they found his luggage very soon.

I feel really sorry for what I bf is going through now.