I remember someone else posting about them last year. Will see if I can find the thread.
EDIT: Found it: www.elitefourum.com/t/english-non-cracked-ice-aritcuno-ex-fire-red-leaf-green/16766/1 Not too much more information however. Mainly others asking the same questions as you. It does contain two more pictures of the Articuno with this error, though. One by @joetehman and one miscut by @regigigagod.
Greetz,
Quuador