I take them off the card and put them in a zip lock bag with a paper towel floder in half to soak up some of the oil
I also throw some moth balls in. I keep all my material in zip lock bags or glass jars, I have collected from hunters over the years a lot of snow shoe rabbits feet, I keep them in a gallon glass jar (with moth balls) also my rabbit skins
One thing I never do is put new aquired stuff with the old till I am sure it is bug free