Board Thread:Questions and Answers/@comment-24822455-20140416023246/@comment-6697950-20140416083022

Nothing was ever said whether or not he ever looked for Sachi in real life. However, it's not exactly as easy as you think, since the identities of all SAO players are kept a secret. The only reason Kazuto was able to get contact details of his friends was because he made a deal with Kikuoka Seijirou and got the contact details in exchange for information about the SAO incident. Whether he was told about Sachi's real life identity was never mentioned.