I left a bunch of .ca domains to expire at godaddy and before they entered the grace period I unlocked them and published the transfer codes in a "for free" topic.
The domains are now well into the grace period and I had a member contact me asking if they could have one of the domains. The member informed me that the transfer code did not work which led us to believe godaddy changed the codes.
When I went into godaddy it also showed the domains were locked and I was not able to unlock them again. Fortunately that is a ruse and the domains are actually unlocked. I ended up requesting the transfer code directly from cira at code.dn.ca and the member was able to retrive the domain.
So before you allow your domains to hit grace please remember to unlock them so you can use the transfer code and allow another member to claim the domain in case they want it.