One of the things my ETC became responsible for was approving personal electronic equipment for use on board. Not quite sure how that happened and not the Electrician's Mates? This would have been mostly "Boomboxes" or cassette players, etc. He may have been suggested by the Eng gang because he was strictly following (I guess) NAVSEA(?? 40 years) Safety requirements and he'd squirt the external plug jacks full of RTV before stickering them. After making several new "friends" we got the word to be less persnickety about it. The issue was safe compatibility with the ship's wiring system and proper, safe grounding. So this commercial besides being a security risk, it could well have been a safety risk (mounted on a pallet??). On the exterior of a ship with specific "stealth" design features.
Reading more up on this, I'm not surprised a not ship's company member spotted it and questioned it. I would have expected it. Homeported in Yokosuka, we'd also have shipyard availabilities in Subic (not these days of course) for exterior maintenance, gear work, we'd have MOTU assistance on particularly wonky gear, any or all of which I'd expect to spot it. They had to run cabling, add other gear - extenders, etc. This wasn't a DIY vcr to tv on the mess decks. And they swap Bue/Gold crews. The Goat Locker should have expected it to be discoverable. Maybe had they played the Welfare and Rec/Morale side openly, some sort of accommodation might have been developed (sometimes "unofficial" command participation can do things. "Shocked, shocked I tell you!"). But this has OpSec, electrical safety, fire safety, penetrating the skin of the ship? issues. Looks like the whole Chief's Mess is compromised to some extent.