Hi there!!
I wrote a not to the ChipGuide Nevada admins and some one will get back to you. In the 2011 Chip Rack, it states the inserts are Orange & PURPLE which is different from both Alex's chip & your scan. With that said, it is out of my hands and hope the Admins with better Nevada knowledge can get to the bottom of this.

Chip Rack also has a separate listing for this chip than Stardust and I feel it should stay that way since there is nothing on the chop states different.

Thanks for questioning the inserts, maybe there were different chips or maybe the purple have faded in varying degrees. I just don't know.

See you in June!
Al