The first attestation of shog

"The first attestation of the word paper (shog) in Tibetan literature appeared in 744-745, while its use for bureaucratic functions would have presupposed prior knowledge of reading and writing in Tibetan script."

Georgios T. Halkias in Luminous Bliss: A Religious History of Pure Land Literature in Tibet. (page 53)

photo from the sde dge printing house, summer 2015.