www.elitefourum.com/t/identifying-shadowless-unlimited-base-set-boxes-packs/16993/1
Probably more information than what you’re wanting, but the article linked above has just about all the information on base set booster boxes and their likelihood of being shadowless you could want.
Here’s a shortened guide:
Does your Green Wing booster box have more than one country code on the bottom of the box? Very unlikely to be shadowless
Does your Green Wing booster box have only one country code on the bottom of the box? There’s a chance, and that chance increases if:
- You can peek through the top flap and see that the booster packs contain Shadowless pack art (see the thread for more info - you don’t want to see the red “Trading Card Game” box that’s on Unlimited Base Set packs)
Did you pass the above test? Still not guaranteed shadowless (but there’s still a chance!), but if you failed this test, DEFINITELY not shadowless
- You can peek through the top flap and see that the booster packs contain not only Shadowless pack art, but also the “long crimp”-style packs. (see the linked thread for more info and pics)
Did you pass the above test? It’s almost guaranteed that the cards are shadowless.