They're not scammer, but cheater since you're trying to connect 2 or more accounts joined in a same campaign.
So it would be better for you to just create a new thread in the reputation board since you're trying to catch bounty cheaters.
P.S. Why do I read the bolded text in your Op as "how do I get merit?"
Although it's true he can create his own thread, but it's a bit ironic to see a 9 days old newbie account want to catch bounty cheaters? His main intention is to get merit, there's nothing wrong about it, but I will not trust him for anything due to this matter.