Collectible Unlocked Event?

[static_recharge]

I'm trying to get my addon to trigger when a collectible is unlocked, specifically when a house is purchased so that I can update my data. However I can't seem to find the event that I thought was there a while back. The event "EVENT_COLLECTIBLE_UPDATED" doesn't seem to fire when I think it should and the "EVENT_COLLECTION_UPDATED" doesn't have any other parameters that it passes to detect what was going on. Anyone have some insight here? Even just tell me where to look in the source code. I looked there but the event that is listed in the source code doesn't exist anymore.

Thanks in advance!