You can always order box lids for the dolls boxes from AG, the same as if you would order replacement parts. I ordered 6 boxes, and lids for the dolls I bought on Ebay that I wanted to put away for my grandaughter. They stack in the closet a lot better that way. They price the bottoms and the lids seperately, so you can buy either, or both. The total cost was $5.00 a box.
One piece was $3.00, and the other $2.00, but I don't remember off hand, which was which.