If vacated in a hurry the furniture would have been left and may well have succumbed to the flame in winter. Generally I would have thought loose structural material would have gone first, as chairs are much nicer than mudddy ammo cases to sit on.
If the house was in a suitable position, parts could be cobbled up to serve as offices/ communications, stores or simply shelter with the use of tarpaulins. In that case furniture could get reused.
Given supply issues there were many odd structures assembled from the ruination - make do and mend was a very real thing then!
Emma