UPDATE 7/15/13. See the answer below in comments. Mahalo for the tips. We did get MPD confirmation that this is a high tech traffic monitoring device.
UPDATE 6/28/13 And just like that the box appears now affixed to a tree along Kenolio (mauka) just north of the Kaiola intersection, seemingly confirming it has no relation to MECO. But the completely unidentified rectangle is moving around North Kihei. What do you think it is?
UPDATE: This morning (6/21/13) this very mysterious box has been removed. In spite of both email and phone call requests to MECO, we have no response, and thus no information.
This week,we observed this new container fastened to a MECO support pole (no electrical lines on it, just cables running to pole across the road) on Ohukai, makai of the Highway in Kihei. It has no visible lines or wires, and minimal marking, save the notice about water leak prevention. We called MECO, who advised sounded nothing of theirs, but since it was on their poll, very interested, advising they would check it out and call me back. No call. Do you know what it is ?