I'm in the same boat. I sold a copy of 35 about a year ago for $10? Pretty sure I have at least one more, but it is not showing in my Collectorz database. I have ALOT of boxes not inventoried yet, and have looked through a bunch plus some short stacks I have dispersed here and there, but to no avail. Maybe I don't have another, oh well.
Anybody is interested the Collectorz database program is pretty cool and will even scan modern upc's which is pretty awesome. Is only like $3-4 a month for both the app which will work on desktop browser plus the clz app for a mobile device for the scanning portion, and they sync up. Well worth it. Now if only I would get all my books databased that would be great.
https://www.collectorz.com/comic/comic-connect