“I’ve seen it on salads that the Star-K deemed too infested to certify. That’s the case when there’s no Star-K inkjetted near the date code on salads that normally have the Star-K.”
I don’t believe that your assumption that the Star-K deemed those packages too infested is accurate. The lack of their inkjet does not indicate such; they didn’t inspect it altogether because it was known the other hashgacha would inspect those batches.