I have a shelf,
And on that shelf
There are jars.
Some labelled,
Some not.

There is one jar
I've been trying to find
Hidden in
Amongst the others;
Identical from the outside.

That jar
Was always labelled
But now that label's gone 
And I can't find 
The right receptacle.

I opened a few
In my hunt
And have to admit
To being skeptical
Of ever finding it!

So if you see a jar
Unlabelled on your shelf
Maybe I could borrow it?
And have a look inside?