I have a friend who had a 40+ inch rear projection TV(not a modern LCD/plasma but one of those much larger ones), a couple of very large wood cabinet speakers(probably at least 3.5-4x1x1 feet) and a small mini fridge(still filled with food) all stolen, during daytime hours, from a 20-25 unit multi-story apartment.
Anecdotal I know, but I wouldn't assume most people are terribly attentive.
Funny you say that since it turned out from surveillance footage from another building that the burglars where dressed as movers and loaded all the items into a small moving van that was double parked.
Forget about stealing safes from apartments, I wouldn't be shocked if you could rob an actual bank vault by dressing as a construction crew.
University I went to had this happen in the summer. Showed up in coveralls and had a paper for the RA to sign. Cleared out all the furniture and appliances. Told the RA that the new stuff was a bit late but would be there in an hour. They were not caught but I question the target’s value.
Anecdotal I know, but I wouldn't assume most people are terribly attentive.