There are probably lots of such frags repurposed as mummy wrappings. Given the advancements in non-invasive methods of coaxing out texts (like the Villa of the Papyri scrolls) CAT scans and whatnot of the mummies might prove quite fruitful, particularly in the so-called Valley of the Golden Mummies, where the Roman-era hoi polloi got the old school treatment but probably on the cheap.
What is paper mache' usually made of? Repurposed newspapers - so the concept didn't start in comparatively recent France.
Maybe his loved ones just wanted to make sure he had something to read while taking care of after-dinner business in the afterlife.
"Roll empty. What to do?"