Instead of cataloguing everything for your heirs if you decide to keep it, don't catalog it at all and maybe they will learn something researching the cards and actually get interested in them. After all, you did all the hard work putting it together, let them earn it
My grandfather passed in 2007 and left his coin collection to my dad who had no interest. He planned on selling everything so he got a price for them and then my dad and I worked out a slightly lower price so I could buy it instead. I had a very small collection of coins but since I got these I've been researching the coins and have actually bought a few more since
I'll tell you another story that had me thinking for just a second. Most people who know me personally, know my dad and I get along great so remember that when I say this. The other day he asked me for the combo to my safe and I gave it to him, the next day I went to work and right before I went on a main highway(for 15 miles) to come home the low tire light came on, screw in the sidewall. I called my dad and said the tire doesnt look low, should I call AAA or try driving home? He said nah you can drive it home...got me thinking for a second. My dad does carpentry too