Just installed this and went to the primitive tribe, I'm at the point where I'm about to deal with that one-eyed merchant for 50 stimpacks for 20 golden gecko hides, i looked at the stash and it seemed fine but me knowing about skill checks there must be something wrong with the shipment, anyone who has downloaded this mod help me out here.

I think you need a high perception or high science/medicine to see that there is something wrong with them.
There is no way to see if there is anything wrong with them otherwise, but you can tell golden man to trust your instinct or whatever and have him not buy them anyway.

I don't like that strange sweaty man anyway. I'm calling the deal off.

With a perception of 7 you can find out that the stimpaks are fake.

http://hem.bredband.net/darek1/f2rp_wt.htm#primitive

You get 15 karma and 500 xp whatever way you solve it!

Already done, trying to get into Navarro now, while trying to decive Chris.