Collector’s Aegises will begin shipping in about a month, with the Collector’s Baby Roshans shipping early 2018. Check your registered email address around that time for shipping information.
— DOTA 2 (@DOTA2) November 14, 2017
Buyers of the compendium who were eligible for the item will start receiving this item via mail in about a month. Valve has already sent out emails to confirm the shipping information for the various eligible buyers.