the sender declined to send you the CD, or
you canceled the request (perhaps in error), or
the system canceled the request because the sender didn't mark the CD mailed, or
the CD was declared Lost in the Mail by SwapaCD, or
you have marked the CD received (perhaps erroneously), or
the CD was not a CD you requested through SwapaCD.
If the sender declined to send you the CD:
Of course, if you did not request this CD from another SwapaCD member, it will not appear anywhere in your SwapaCD account.
Related items:
If you think you are not getting your SwapaCD emails...
My request disappeared!
A CD I requested is lost in the mail. What now?