When Lyn and I were there we asked politely if there was any way we could acquire some. We were politely told 'no'. Those in the racks were extremely worn.
The owner did tell us that to his knowledge they were never in play, they were probably drinks tokens or similar. He showed us various other obsoletes from the 'cupboard' (They dont have a 'cage'). He sold me some $5's. He offered me higher denoms also but seeing as they sell for under face I declined