Bought jars sold as new but they are ink stamped?

Hey everyone, I’m hoping someone here has glass jar manufacturing experience. I buy new glass jars from a local distributor. Since the pandemic I’ve noticed all of my jars of a particular size are ink stamped in white with a series of numbers. Anyone know what this indicates? It’s something I’ve only seen on retail jars filled with product. Is what I’m buying suspect/used jars or are these legitimately new jars? Thanks in advance.