Print out is sufficient. Certified print out is not required by law. It is in the discretion of the adjudicating officer to ask for it, but I have not seen it being asked once.
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Copies should be sufficient.
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What you have is sufficient unless and until the USCIS officer requests something different.
J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature and does not constitute legal advice, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship. Answers on Avvo can only be general ones, as specific answers would require knowledge of all the facts. As such, they may or may not apply to the question.