Norm-

For me the boxes they get the cards/keys in at the Casino's, come in boxes that hold 500 cards/keys each,they are made of heavy cardboard and they have a lid , you can stack them as high as you wish. Your favorite Casino normally will save or give you these for free. I mark the outside of each box where cards/keys are from for quick reference. I used some of these boxes for traders or for selling them,beside collection. Be careful as to the shelves you place them on as they are heavy. I did have one of my first set of shelves cave in and it took me forever re sorting over 200 boxes of cards/keys, I now use wire racks with 1,500 pounds per shelf for my cards/keys.

Ron