Use the Search feature to your advantage! CLICK HERE TO OPEN THE ADVANCED SEARCH FEATURE!
If you got it from a thread here, then what you do is:
* tell it to search for the word "pass" -OR- "password"
* tell it to return hits as POSTS, not as threads, by clicking the appropriate radio button
* tell it to look only for posts written by the guy who uploaded the file/torrent
* tell it to look only for posts submitted
starting with when the thread was posted and going forward from there. Don't tell it when to stop in case the password was uploaded much later, as sometimes passwords have been uploaded 1-2 weeks after the torrent went up. :\
This should help you determine whether the password is available on Akiba-Online or is not.
Otherwise, I very much agree with soletta.