I have 2013 fireworks that no one else has. [They explode creeper heads ] Boom, rare baby. Yeah, I said it :3
Diamonds, trade grass Grass, vote here Probably a billion more stuff that I dont feel like typing right now
There rarest items on the server are any items that have been unable to be duped. There are some special Cyp and Crew heads, rare named items that are unique are often rare. The value of items to you is personal.
There are items that float around that are very rare and ate owned purely by people who bought donor400 for themselves. Those items sometimes cannot be traded because of this.
It's just a block texture that wasn't updated. You can't make them to my knowledge, but the players that originally had them stored a chest were just regular blocks that changed according to the update