I believe just the two tall shelves do. The rest act as shelves to put items in. I'm still testing them out. There are a couple of wall-mounted bookcases and storage selves. (View Post)
They should be in your sim's inventory. Also in more detail: Sims are able to knit various usable objects and clothing, and then sell them on Plopsy, an online craft-sharing store akin to Etsy. Knitt… (View Post)