I see you purchased a Piezography matte/gloss setup for your 3880 printer in Nov 2013, are you just installing the inks and carts? If so, I hope you shook all the ink bottles before filling carts.
Just like when printing a nozzle check with Epson inks, only 8 colors/channels print (only one black prints at a time, depending on which black ink mode you're in).
From left to right, the order of the 3880 nozzle check is: K, LK, LLK, C, M, LC, LM + Y. For Piezography inks, this translates to be: shade 1, 6, GO, 2, 4, 3, 5 + 7. (shade 1 is black, and 7 is VERY light)
GO prints clear, and is only visible on glossy paper, and shade 7 is VERY light, so some people have a hard time seeing it on plain typing paper.
I hope this helps.
Best regards and happy printing~ Dana