If the tags are listed as issued in PALS, then the treasurer is where this needs to get resolved.
The treasurer can tell the OP if/when the tags were mailed. In my case, the Berks treasurer told me when they mail tags out and that mine were definitively mailed a long time before I called to inquire. She then told me exactly what to do to get no-cost replacements, and it was handled very, very promptly and I had my tags replaced and in my hand in a few days.
Or, the treasurer can tell the OP that tags won't be mailed until [insert date here].
We can speculate all we want, but the OP calling the treasurer was exactly the right move to find out really what has occurred and what the next steps should be.