Being a TOW owner I can certainly say he's not looking for the expended tube (although handy for the rest of the collection)
He's asking for the launch tube (photo) of which a longer version was used prior to around 1972 or so when they shortened the length of the launch barrel (about a foot+). Earlier systems did not have night sights either.
V/R W. Winget
Not to steal the post, but I'm looking for a night sight and a few dead batteries if anyone stumbles across some.WAW
Post 1972 version:
Earlier (long) version