It's a good sign that the client is the named Registrant and Administrative contact. Tell them to view the WHOIS record for the domain and check that their contact details are correct.
And then to email the Registration Service (Sectorlink) at the address shown there, sending from their @voyager.net email account shown in the WHOIS. Sectorlink should be able to offer them support. The client should also decide whether they want to maintain registration of the domain name or allow it to expire.
Make sure the client is aware that if the domain is allowed to expire (26th Feb 2012) it's likely to be acquired by someone else, and may be exploited for commercial ends unrelated to it's former purpose, hawking Viagra for example. As the domain tops Google for "roselli foods" I'd advise them to retain it if they are still trading under the name or may wish to in future.