In https://godaddy.com/help/bid-on-expiring-domains-893, GoDaddy say:
If a domain name registered with us after May 2, 2005 expires, we automatically list it for auction on GoDaddy Auctions® 25 days later. You can bid on any expiring domain name listed at GoDaddy Auctions.
They don’t explain what happens with domains registered before 2005. Does anyone have experience with this?