Your local energy provider provides you with Natural Gas and Electricity.
This cache is to let you know about your surroundings, often times we take for a granted the utilities that come to our homes and businesses.
This device is called a rectifier. It positively charges the gas pipe system, to eliminate corrosion of metal pipe. Recently an Energy Provider was in the news because this device may or may not have been operating correctly. (it was recently discovered that it was operating correctly and that the fault of the gas explosion was not the energy's negligence.)
With the advent of plastic pipe (nearly all-new gas installation is plastic) Gas companies will need fewer rectifiers in the future. There's not much too look at here, so, just do your business and move on. Stealth may be required but the cache container should be within your hands in the not too far off future.
Enjoy!