A friend just gave me a sealed factory box of 1000 Ideal 6.5mm Gas Checks that look like they are from the 50s. Brown paperboard taped shut top and bottom. Ideal label stuck on one side of it. I won't open it to see if they are brass or copper. Would this box and contents have any collectability? Thanks in advance, and please don't ask to buy them here. After I get some input, I will decide whether to keep them or sell them. Thanks in advance for input! Tomon