How would you handle this (possible poacher)

You can probably call the number and explain the whole thing, who told you about it, who it is...Unless you can go back and readily talk to the guy to get more info theres really no reason trying to go back to get anymore info. When you call, you will more then likely be talkin to some lady in an office somewhere so express the fact about the outlaws that live in the house. If you just tell the law what you heard then you have done your part

Anonymous tip as said with as much information as you have!

I say spotting scope, 750 yards, 150g Accubond, shootin sticks, and a M70 Win. Wait till he shoots, then pull the trigger. Problem solved. I HATE poachers!

Anonymous tip... Call the FWC incident line from a pay phone.

Well there is always the "universal language" Anyone in any part of the world speaking any language always understands a good "punch in the face" LOL

I have not met anyone in the world who dont know what that means!