There is an auction for an HP-67 in which the seller states in part:
"I recently purchased the calculator at a local estate sale. I don’t know a lot about the calculator but I’m sure there’s someone out there who can appreciate its complexity.....The calculator does not have a battery or adaptor, so I haven’t been able to see if/how it works. There is also a copper prong missing in the battery compartment. I don’t know if the prongs are essential or if they’re just a cushion or spring for the battery."
Also, in another place the magnetic cards are referred to as "labels". Well, I guess that is partially correct.
Oh well, maybe someone will pick it up cheaply for parts.