It's not speculation. You're spot-on. I touched upon it in my thread regarding that Leelkase oday whose text was from the 17th or 18th century. When the Italians and Brits showed up they noted that a lot of the oral traditions of Koonfur and Xamar being recounted to them by Gibil Madow and Gibil Cad tribes seemed to be written down. As in the individuals telling them these stories would literally stop to consult manuscripts they were holding (
@Idilinaa knows this better than me). I haven't checked the source as I'm busy nowadays but I recall this touching on that:
A lot of these manuscripts got looted the hell out of when the civil war struck Xamar. I've encountered firsthand Somali odays who've told me about old manuscripts their family donated to the government/museum that were ultimately looted. You'll even sometimes rarely encounter some Indian dude or collector offering to sell them alongside Somali swords, daggers and so forth.