(This is not really a bug, so I moved it to Ideas.)
The old tree poison is no longer available in the game unless it was sourced before we added potions (you can only get it from other players in general), so consider it something that will be an extinct item. Give the gift of a new tree poison potion! :)
The CrabPod headphones are sort of a special no value item that we treat a bit differently than objects you can use in the game. There are a few items that are like that which can't get placed in the box. Maybe they can be put in there sometime though!