Right but it was only after the reporters starting asking questions. The solid enclosure looked like it could be there permanently.

That doesn't look like a solid enclosure to me at all. Sure it's somewhat tamper-proof and meant to look like some phone/electric company component, but it really doesn't look permanent to me at all.

I suspect it was an investigative agency like the FBI or DEA or even DHS doing surveillance for a somewhat specific reason. It could be drug trade, it could be domestic militants, it could be threats against the president