I know what you mean about finding homes for those old 78s. A number of years ago, we also had to "find a home" for a bunch of 78s from our grandparents day (as well as a bunch of 45s and 33⅓s, and record players to play them). They'd probably be worth a small fortune today, to some sentimental collectors.
Not sure about this, but I believe Fiji Hill might have a collection of historic 78s, and I bet he could probably direct you to somebody, or some web site, or place, where you could find a new home for your collection. (Good luck with that effort.)
(Do you remember this song on a 78?)