I don't want to tell the seller what he should do, its his money and his reputation and i really don't care but it seams like he doesn't make any research before he buys domains from auctions, other people, etc.
As an example: you are offering twutter . com at ebay right now
now check out this article
http://fusible.com/2011/11/twitter-wins-dispute-over-highly-trafficked-typo-domain-twiter-com/
and specially this sentence
Now with the twiter.com win under its belt, it wouldnโt be surprising to see the company file disputes against other typo domains such as twutter.com, which uses the same type of redirect to a scam survey site as twiter.com has used.
the domain you bought was
1) used as a scam survey site in the past
2) is a typo of twitter, a clear case of bad faith using typo traffic
My advice for you (and your lawyer): educate yourself a bit more before "investing" in domains.
You may end up losing a lot of money, WIPOs, and your reputation.
And i can tell you and your lawyer that your ebay disclaimers won't help against twitter or any other company!
Just a well meant hint.
Use Archive.org, google, Whois records, past news, etc. BEFORE you buy a domain.