Im going to assume they where blank money orders from the village that were handed over to the pilot to pay for air fare or something similar, so they could very well have been left blank.  Probably explains why it took so long for someone to connect the dots and get suspicious. 

Knowing who's distributing and catching them in a lawful manor for prosecution are two different things. There's no conspiracy, if that's what you where implying. 

I know many functioning alcoholics who work successful careers. I don't know, but I would imagine you could be a functioning heroin user just the same.