Topic Didn't receive Frosty's Collar from Mail
This is probably something better asked on the Customer Support forum.
I know that on WotLK launch day the pet was there when I logged in after upgrading my account. I don't actually recall how much of a lapse there was between the two events but it was definitely less than 24-hours.
Did you at least get the FoS recognising that you are now using a Collector's Edition WotLK?
Sorry, what is FoS?
If you mean by achievement, i can only get the achievement when i receive the item (Frosty's Collar Item)
I added the key in account management, hours ago. It stated that i have Wrath of the Lich King Collectors Edition.. but of course it will automatically update to the latest Expansion Box which is Mist of Pandaria
Try doing a password change. That may give it a nudge.
If that does not work, then you may need to open an in-game ticket or through the support link at the top of this page.
FoS = Feats of Strength
PS: there are currently on-going realm issues. so that may be causing the slow update.