Um, all the furniture is back, however...
It appears that every time I took something out of the warehouse to try to replace what had vanished, the game remembered and now ALL the furniture items (that I ever placed, maybe?) are stacked on top of each other. It won't let me 1) put them in the warehouse or 2) move them. Also, I can't place any furniture from my inventory. It just keeps giving me the message that "You must be in a house to add furniture." That message popped in no matter which room I was in.
Tonight I was able to remove most of the 100 or so extra items, and was able to place items in the house as well. There are two things I want to report:
1) there are a few things that are "sunken" into the floor, and I can't delete them, although I can move them around.
2) there are some items that are _not_ sunk into the floor, but while I can move them, I can't get rid of them.
I logged out and back in a couple of times and those things (both categories) had migrated back to where they had been before, even if I moved them outside the house.
Is this something I should report via email to customer service/help desk?