This looks similar to an apt complex I had a call to a while back. After a rain, they called and complained of half the site lighting being out. I found a couple of concrete "pull boxes" similar to this, with old 60's #12 TW made up with regular red wire nuts, simply stubbed from what Im guessing used
to be EMT. Rumor from one of the leasing agents that the maintenance guys used to wire Xmas lights in to that crap come the season!