The REAL movie PLOT :
1)The bikers steal the stamps but they are not in the con. Marcos and Juan go PLAN B and they try to get the second fakes stamps to sell to Vidal Gandolfo (althougt Marco thinks they are the original)
2)Vidal Gadolfo is in the con. There are NO nueves reinas stamps. When the bikers steal the stamps are in the con. So next, Marcos and Juan have go to buy the others (they are fake and only Marco thinks they are original)and in that way the con is completed (==Marco loses the 200.000 dollars)
Which one do you believe is real? I believe is the second one. If you have another possible senario tell me. I want to understand exactly the plot of the movie :)