The Chip Rack has them pretty well identified, John. In the case of the Jolly Trolley, the DIECAR mold $100 is listed as the real chip. The "imitation" $100 chips are all NEVADA mold for this club. Another giveaway is the opening and closing dates on the imitiation chips.
Note that the real chip has incuse dice and cards. This is an important distinction for some of the imitations from other casinos.
The JT $100 is still only a $30-40 chip, indicating that quantities of chips were disposed of after closing. This possibility is more of a trap for new collectors than the existence of imitation chips. Not to say you shouldn't collect Jolly Trolley, but just need to be aware that there are many more older chips availble to collectors than would be the case for a club where all chips were destroyed or cancelled.