If they're really doing that for the "keep it on the low down", seems like it would be better to use a complete cable, just with nothing plugged into the other end. As the office IT guy, if I were walking around doing checks and saw that, I'd (to paraphrase G98) say "WTF?" then just pull the cable and toss it. I can see its value if you DON'T leave it plugged in and just have it tossed in a junk drawer or whatever for camouflage.
