I was once shown a whole bucketful (literally!) of these
fakes by a dealer in
Britain, who was offering them as genuine.
Actually, the genuine ones are not terribly
rare, and were not theatre tokens but clay
seals (bullae) used to seal legal documents, parcels, food and drinking jars, boxes, shops, goods subject to customs duties, and so on.
Many come from
Mesopotamia and Northern Syria/Commagene, especially Zeugma and Doliche. The
Gaziantep Museum alone has over 140,000 "clay seal impressions" from Zeugma.