I have a couple of the treasure boxes lying around in my backpack and am curious to know what lies inside those?
Are they just vanity items (such as the one item drop I received). Or are they actually good starter items worth the cost of the keys.
Do you get keys as drops or these have to be exclusively bought or traded?
Best Answer
If you click on your Dark Treasure in the backpack, you can see which items can pop out of it.
About the items in it:
source: Dota 2 wiki
About the keys:
So, in the end: items are just cosmetic, you can still trade them upon opening the box. You require to buy the correct key from the shop. Some chests may contain a special kind of courier.