Rather than run a few extra feet of wire, they had sealed up this splice in the wall. While it’s doubtful that it actually would’ve caused any problems, it’s not a good practice (nor does it meet code) to seal up a splice in a wall cavity.
Although this wasn’t as bad as the wire that was routed into the bathroom plaster (and skim coated over), it was one of many finds that led us to the decision to rewire the entire house. Since wiring is one of Julio’s strong suits, it was much more of a time issue than a money one. And in the early stages of the project, time seemed infinite. Months later, that sentiment would change..