ACT 3 Spoilers Where to use a certain item

[Sulik2]

Where do you use the holo rabbits you get in act 3? I cannot find the trader he mentions when you buy the one. I swear I remember seeing him but I cant find him.

[Sentorian]

The pelts? At a certain point a room opens up that you can go into when you get up from the table, and you can use them there.

[TickTockBent]

It's a door that opens later in the area you can explore around the game board. It's actually right next to you, on your left while you are playing.

[Kuros]

When you stand up, at your left. The door opens after the third boss battle iirc