If they're taped shut, just cut them with scissors, but by the way i'm reading your response, they're probably heat sealed. If so, take an X-Acto hobby knife around the edges to slit the package. You dont need to cut all the sides, just three so it will "hinge" open. The plastic is somewhat thick, so if you're not used to an X-Acto knife, you may want to wear some protection, like gardening gloves incase you slip. If you don't have a hobby knife, you could probably just cut the thing apart with scissors. I don't know how likely this would be to kill the cards, so the knife is your best bet.I hope that made some sense.