You can ask them directly who makes them, how much they are, etc, if you get a good cover story and make some for the purpose you used to ask.
Then you can place a new order with the company they use since they already make them.
But this sounds like some serious shit. You're pretty much counterfeiting money. I mean, it might not be that bad, but it is a counterfeiting operation, and you might want to re-think this.