Did my phone came already rooted?

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http://forum.xda-developers.com – Good Morning Guys! My brother just bought a Samsung Galaxy S3. We opened the beautiful phone and we noticed it was pre installed with superuser. I was wondering if it was rooted. I am able to uninstall Verizon apps that came along with it. If you need any more info I may provide it. Thanks in advance! (HowTos)