I also was thinking to check the gas stops. Have them look over their surveillance tapes. Maybe other businesses have road traffic in the background........ or traffic monitors may have video, too. If the media grabs this story (it is unusual to the public), the coverage may bring up other tips. Get your story and pictures on your web page. Can't hurt.

At this point, you should not have yet ruled out anyone, including a fox guarding the hen house. The perpetrator either had all the time in the world, or he did it quickly. Depends on who it was and if they knew the owner was out of state. Strange that the land owner is tied to both sites where you lost bees, you know? Also, could have been helpers who may have done something without his knowledge. Physically check on any other of his other sites. Bring your camera and a notebook.

Sorry to hear of your loss.