What would an cable connected to a box underneath the electric meter be doing buried across the yard going to the neighbors house?

Found a orange cable connected to a box that sits underneath the electric meter box. When I followed this orange cable it was partly exposed after mowing but mostly it was buried and it went underneath the deck, underneath a fence in the backyard and then it is leading straight into the nieghbor's box on the... show more Found a orange cable connected to a box that sits underneath the electric meter box. When I followed this orange cable it was partly exposed after mowing but mostly it was buried and it went underneath the deck, underneath a fence in the backyard and then it is leading straight into the nieghbor's box on the side of his house. These are good neighbors, not shady or anything, but what on earth is this? Could it be something the builders left behind? Only problem with that is it would've been easier for them to connect to the house on the other side of us if they needed to tap into another home's electric during construction. Plus the fact the part of the cable running up the side of the house has PVC pipe over it and new hardware such as bolts. It almost appears like someone was trying to camouflage it with the PVC pipe. This would've had to be professionally installed due to the type box it fits into. .
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