I have a 200 tl (the 12" version) which I use in my bathroom. Mine was bought new and there was nothing included with it like what you describe.
It could be a stand like was mentioned or maybe used to partially close off the port. I have my port stuffed completely. It limits the maximum output but tightens the bass a bit. When used for my HT room I did not close the port.
I did take a 100 tl home to audition but decided to spend a little more for extra measure even though the 100 tl did fine in my 14' x 22' room.
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