From the Sweepstakes Rules:
"Winners list.
A list of Sweepstakes winners is available by sending a
stamped and self-addressed envelope marked to "Monthly Challenge
Sweepstakes Winners, [insert relevant Month (e.g. August)]," 180 Sansome
Street, 5th Floor, San Francisco, CA 94104. Requests must be received
within 30 days following the end of the Sweepstakes Period for which
the Sweepstakes winner's list is requested."
Odd entry (to me) from the same Rules:
" Any Canadian potential winner must also correctly answer a
mathematical skill-based question administered by the Sponsor in order
to claim prize."
What's up with that?