No CIS doesn't require proof ... normally. But, sometimes they do.
Get a letter from the organization and put it into your file ... just incase.
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Mention only your full-time employer. There is no requirement to provide pay stubs or any other proof of prior employment.
Behar Intl. Counsel 619.234.5962 Kindly be advised that the answer above is only general in nature cannot be construed as legal advice, given that not enough facts are known. It is your responsibility to retain a lawyer to analyze the facts specific to your particular situation in order to give you specific advice. Specific answers will require cognizance of all pertinent facts about your case. Any answers offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship.
You are required to document maintaining status towards COS, but the SEVIS seems to be sufficient for that. If you will be using the volunteer experience towards H-1B eligibility, then you may want to document it with an experience letter
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