I too have been hoodooed by the "gang of 4" I have a couple that also  weigh very close and they look good. Another way they are fake is that the reverse is out of kilter with the front. I bought 4 in  graded cases. I removed them and sent them to ICG . All were returned as ungradable ,unknown origin, etc. At this point ,I would suggest not buying any trade dollars from anywhere outside the US. I have some nice heavy coins the grandkids can play with now. I hope this will help someone . Thanks GW Smith