Wow, I didn't realize that so many were lost.
From The Lost Media Wiki
When I was little I watched this show constantly, and some of these lost episodes I vividly remember. Just sucks we never recorded any of them. The one I remember the most was Grandma Flutters 100th Birthday. I also remember Appreciation Day. If I remember correctly in that one there were barely any scenes in the actual house, and most scenes were all out in other places in Woodland Valley.