The RAF Museum have a random collection of Flying Logs.
Indeed with the agreement of my mother I gave them my father's one to them.
My own father's log books and medal set are with the museum. They were interested as he illustrated his books with photographs, quotations and newspaper clippings making into a kind of scrap book of his war service. He was a Navigator, Radio and Radar Operator in night fighters. Rather unusually, his pilot and he stayed together throughout - if a posting came up for one of them - they turned it down. Consequently, they carried out three and half tours, 104 ops (or might be 106, I forget).
Before he gave his books to the RAF, he had them scanned so we have both books as PDFs. His grandson who became a commercial pilot, had a copy bound into two books to replicate the originals.