The Ba–Shu scripts are three undeciphered scripts found on bronzeware from the states of Ba and Shu in the Sichuan basin in the 5th and 4th centuries BC. Numerous signature seals have been found in Ba–Shu graves, suggesting that the states used written records, though none have been found. The known inscriptions are too few to be deciphered, or even to identify the language recorded.

More information on the Wikipedia page [1]

The Wikipedia page on Ba-Shu Chinese is [2].