As they were found in the vicinity of a temple precinct, and are in an idiopathic script (towards the end of the article they note that small groups of scribes

As they were found in the vicinity of a temple precinct, and are in an idiopathic script (towards the end of the article they note that small groups of scribes may have had their own local cultivar of script), they’re likely either ritual/offertory, or possibly more mundane - scribes learning to write with set pieces they know orally by rote. The article doesn’t mention it, but there are other examples of “learner” hands throughout antiquity, and even through to modernity - this could be an ancient example of a simplified script intended for beginners.