In a skirmish list can you use more than one copy of the same skirmish upgrade card? For instance with the Wookie Warriors pack there is the Fury of Kashyyyk card that is a Skirmish Upgrade Attachment. Can I use multiple copies of that card on multiple groups of Wookies? Based upon the preview image of the card it doesn't have the square block preceding the name of the card used to identify it as unique.

Correct.