Well it appears I got far more than I bargained for when I bought those random boxes a few weeks back. The last two boxes I bought for myself were both 76-77 OPC boxes, but the second of these two boxes also had some 74-75 OPC as well as a bunch of other stuff. Included in that stuff was a pile of checklists from the 70's up to the 90's in various conditions. I will save that for another day, but here was some of the highlights from the other "stuff".
74-75 OPC Bruins Team Leader #28
75-76 OPC Ken Dryden #35
74-75 OPC WHA Jacques Plante #64
As far as value goes, they are all worthless, but if you were lucky to have these in decent condition, they are relatively valuable cards. To me, these cards are priceless and I would never give these cards away because they are just too cool. Do you have any beat up cards that you treasure more than a mint condition card?