Re: How to tell if swarm from your own hive?
Bees are unionized... If they came from one of your hives they would have little picket signs protesting the work conditions in one of your hives.
If you were in the yard it is pretty obvious when a hive swarms... The tone of the hive changes and then you hear a rotor like sound for a few minutes. A traveling swarm doesn't make nearly as much noise as an emerging swarm from a hive.
Good Judgement comes from Experience. Experience comes from Poor Judgement.