I've got three 3TTT stems that no one wants (dark grey, Ti, and alloy), all with the plug.
First thing that everyone asks: do you have the plug?

+1 On the Ti 3TTT quill (a $140 stem when new), the LBS, in its wisdom, swapped it out and forgot the plug. I had to look all over there for it. Now, nothing goes to LBS that may not come back (pedals, seat bag, cyclo, stem plugs, valve caps, etc.)