User blog comment:UnboundIsaac/Presents, w00t!/@comment-5686539-20151213154431

I know I'm a little late to the party here, but I'd like to share what little I know of the subject. On mobile, the "Christmas" event starts much earlier than on PC/console. Officially, I think the event starts on December 1st. In addition, the drop rates for presents on mobile are much higher than on PC/console. As for the 3 presents required for loot, I have not heard anything of the sort. Then again, I only know what I know of the mobile version from what I've read on the Terraria Community Forums.

Maybe what you're experiencing is a bug?