Hi Richard. What made me think that it is the third version is nothing to do with the suqare or rounded edges but the text of Laughlin, NV itself. Much smaller than the other versions...and after looking at your site it might be that is was released in 2004. You have a $3 chip for the poker room listed with the small text. Maybe a re-order with other chips for the poker room??

Cheers, Tim.