Luzdoh
The chances of following the money are practically impossible these people will always be 1/2/3/ steps ahead. The only chance is to have one of 'them' on 'our' side.
As for the transportation of the arms, once again, I don't hold out hope. These arms are being transported across some very dodgy borders where there are guards on piss poor wages who will just wave them through (because they are expecting the truck). They don't know (or care) what's being transported, they just know that they have a bit more money in their pocket.