Binary package hint: nautilus
With hardy, the contents of the trash is at ~/.local/share/Trash, but users who upgrade from gutsy may still have files in the old location, ~/.Trash.
There are two issues here: first, these files appear to be "lost" to the user. Users expect to be able to recover stuff from the Trash, and may be dismayed to find that after the files which they expect to be in the Trash are "no longer there". (That is to say, when they open the Trash, they won't see the old contents that is hidden away in ~/.Trash -- their files appear to be gone forever.) The second issue is that the contents of ~/.Trash may be consuming disk space that is not recovered by "emptying the trash" (because emptying the trash only empties the new trash).
(I don't know if "nautilus" is the appropriate package -- sorry.)
Thank you for your bug report, that's a known issue, you can read http://