Question for experienced commissioners/owners:

Let's say you had reason to suspect a possible alias account in your world. No hugely obvious "smoking guns" like obviously one-sided trades, but a new account/owner who seems way too knowledgeable to be a newbie, and who has made a bunch of trades--half of them with the same owner. And let's say that a couple of other experienced owners in your world have noticed this as well. As commissioner, what exactly can you do here? Will sending in a ticket get any response? Any suggestions appreciated. Thanks!

WifS will tell you if they have the same IP number.   But, often, the users will say "That's my son" or "We're roommates".   So, unless they're doing something removal-worthy, you're sort of ******* in the wind. 

All you can do is tell them