Leininger's 3 bears

A young nurse came upon a wooden box in the woods. It appeared as if something lived in the box.
In the box, the nurse found concave stones holding soft substances at various temperatures.
She also found L shaped items perched on 4 legs with various pliability
She found a box within the box that contained square soft on top of platforms.
This is very strange to me.
Just then 3 fuzzy creatures came into the box
What are you doing in our home, In our bedroom?
Oh wow! I thought this was a wooden box , with another box inside.
What do you call these concave stones?
And what are these L shaped things?
Those are our chairs that we can sit on while we eat to rest our legs
Theses are our dishes with our breakfast which we were allowing to cool while we went for a walk
I have distant relatives that live in dens, we believe that living in a cabin is better for our health
I never stopped to explore and understand ways that others may live. I always thought that bears lived in dens