This is the key.
The mystery key.

The key to what?
I'm not
quite sure.
I wonder what
this key is for?

Let me see.....
could it be:

the key to the door
of a treasure store?

the key to a lid
where things lie hid?

a secret box
with magic locks?

the key to a cupboard,
a closet, a drawer?

I wonder what
this key is for?

When I find it
I'll unlock it,

but meanwhile keep
this key
in my pocket.