Maybe they did but no one recognizes it (like the knotted string records of one of the South American civilizations), or it was all scratched onto palm paper or palm leaves that rotted away.
That is true. look at the Dead Sea Scrolls, for example. Hand written on fragile papyrus, they never would have survived 2000 years until they were discovered if they were not stored undisturbed in an arid area in caves, covered with bat guano. As it was, they started to disintegrate after they were removed are now stored in climate controlled containers or displays.