It's not guesswork when I report there are 2 full deeps.
You're proposing an autopsy before the patient is dead.
How do you know anything about what is going on inside that hive without looking? You don't.
When did you last see 2 full deeps of bees? How many frames of brood and honey were there?
I proposed an inspection on a colony 'best described by your posts' as being robbed out, (dead, done and empty of any resemblance of its former self).
You have described "robbing that has gone on for over a week" on one hive of bees. My bet remains placed that they are all dead and gone, but unless 'someone' actually looks we'll never know for certain, will we.
Sorry, but looking is part of keeping bees. No room for guesswork or assumptions. Doing so is at at your bees peril and wastes time best spent investigating.
Robbers can include more than just other honeybees, the list include, hornets (yellowjackest), wasps and other bees like bumbles,,,,oh,,,and beekeepers :-D.