The answer is to wait a couple of years. Hockey Card prices have been decreasing for 15 years. Cases I bought several years ago for $1200-$1500 I am buying now for $200-$300 (with some exceptions). There is a huge gap currently with cards starting wi...
I heard that the Joe Blackburn #119 goes for $5, don't know about the others
Go to your local hobby store, that sells hockey cards. And ask him how much he would pay, or put an ad online or in local newspaper. You can make a SH*T load of money man!