Where are Gold Boxes from from?

So much for the Monster Book updating to match the actual drops... no gold boxes on the Cold Shark drop list.

Mistaken understanding here; There are two types of monster drops, explicit and scripted.
Explicit are in the actual drop table, manually entered mob by mob.
Scripted are triggered by events. Monster cards for example are scripted. They don't show up in the drop table. The original monster cards that every monster had a chance to drop were as well. Most events like this are as well.

So apparently the monster book only shows explicit drops, not scripted ones, which isn't that surprising really.