Its a fun project, you are relentless!
I am just wondering if you know about telephone scribbles on office blotters. Every desk had one in my youth, and people on the phone would scribble without thinking while talking on the phone (they were something of a hit in the heydays of surrealism and Dada).
Decades ago I seen a blotter for sale at a Vancouver (Canada) art gallery by Andrew Wyeth. It was filled with his scribbles, and one of them must have been a long phone call, because it was a meticulously drawn coil of rope. The price was quite steep, so since then, I never threw anything away that I had ever scribbled. As faith has it, there is likely still a large carton full of it stored in my house in Canada.