I went through my mother's recipe boxes today. I don't know why I never thought to before - she's been gone eight years.
Some were definitely familiar, others not, and I suppose many were just ones she'd collected but never made, and none of them were entirely her own creations. She was a very good cook, but I think she went on inspiration as she was cooking, but didn't record any of that.
So I saved about one quarter of them. Cooking was such a different prospect back then, with so much cheesy casserole-y stuff, so much Campbell's soup in the recipe, etc. I don't cook like that very often. I didn't save anything which we won't be eating, but I found plenty of interest.