A couple questions about sleek wands:

You can find your amber and sienna at level 30, and black at level 35--right?

Do you have to be in the room when the mob dies, or just in the area, for the wand to actually show up? If I fled out of the room and the mob died to my groupmate, would the sleek have showed up?

If I stand in an area and have someone else look around (like a thief peeking at the inventory of a mob) or looking in a container, would they see the sleek, or is it not until I'm in the actual room and/or when the mob dies?