A good way to find if someone's a hacker or not is to check their Stamp Book. Sometimes people hack to get the Shamrock Pin but because the pin was released in 2006 there may be a huge gap in between the Shamrock Pin and other pins they have. This person is most likely a hacker. I made a similar forum post about a month ago where I found a penguin wearing an unreleased pin (Dubstep DJ Pin). I put a picture of the hacker if you want to see.