You can use the "I didn't know" defense but you better have a darn good case as to why you didn't know. Lawyers will do ANYTHING to make you look bad. It's their job. And as stated before, Apple has a whole team of lawyers that will destroy this kid. Yes he did buy the stolen parts but if there is even a slight chance that he knew, lawyers will capitalize on it and take this kid down.
And with Apple doing that I hope they get tons of bad PR and flack for it. Apple should of just sent letter and demand that he stop and that would be the end of it. But instead Apple is being Apple and showing their true colors and it is not pretty.