I got feed back from reviewer and it is not the permission angle that was objectionable. It was that is was magnetic on a transformer box that may have official stickers with electric shock warning. So reviewer was ok for it to be placed behind the box but not on it. I know of many caches magnetic ones that are attached to transformer boxes. Reviewer was ok for caches on power poles as they don't have any warning signs on them. I know that many do have warning signs on them even the concrete ones.
So this may be a new interpretation of rules or maybe this reviewer is pedantic about electricity. After all they are in the public and able to be touches lent on climbed on anytime of the day.
Personally it is more dangerous to cross the road than these boxes. They are more prone to explode or go on fire than cause any electric shocks.