You may have to be creative.
http://ecfr.gpoaccess.gov/cgi/t/tex...=div8&view=text&node=8:1.0.1.2.6.1.1.2&idno=8
See 8 CFR 103.2 especially (b)(2)
(b)
Evidence and processing.
(1)
Demonstrating eligibility. An applicant or petitioner must establish that he or she is eligible for the requested benefit at the time of filing the benefit request and must continue to be eligible through adjudication. Each benefit request must be properly completed and filed with all initial evidence required by applicable regulations and other USCIS instructions. Any evidence submitted in connection with a benefit request is incorporated into and considered part of the request.
(2)
Submitting secondary evidence and affidavits —
(i)
General. The non-existence or other unavailability of required evidence creates a presumption of ineligibility. If a required document, such as a birth or marriage certificate, does not exist or cannot be obtained, an applicant or petitioner must demonstrate this and submit secondary evidence, such as church or school records, pertinent to the facts at issue. If secondary evidence also does not exist or cannot be obtained, the applicant or petitioner must demonstrate the unavailability of both the required document and relevant secondary evidence, and submit
two or more affidavits, sworn to or affirmed by persons who are not parties to the petition who have direct personal knowledge of the event and circumstances. Secondary evidence must overcome the unavailability of primary evidence, and affidavits must overcome the unavailability of both primary and secondary evidence.
(ii)
Demonstrating that a record is not available. Where a record does not exist, the applicant or petitioner must submit an original written statement on government letterhead establishing this from the relevant government or other authority. The statement must indicate the reason the record does not exist, and indicate whether similar records for the time and place are available. However, a certification from an appropriate foreign government that a document does not exist is not required where the Department of State's Foreign Affairs Manual indicates this type of document generally does not exist. An applicant or petitioner who has not been able to acquire the necessary document or statement from the relevant foreign authority may submit evidence that repeated good faith attempts were made to obtain the required document or statement. However, where USCIS finds that such documents or statements are generally available, it may require that the applicant or petitioner submit the required document or statement.
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(3)
Translations. Any document containing foreign language submitted to USCIS shall be accompanied by a full English language translation which the translator has certified as complete and accurate, and by the translator's certification that he or she is competent to translate from the foreign language into English.
(4)
Supporting documents. Original or photocopied documents which are required to support any benefit request must be submitted in accordance with the form instructions.
(5)
Request for an original document. USCIS may, at any time, request submission of an original document for review. The request will set a deadline for submission of the original document. Failure to submit the requested original document by the deadline may result in denial or revocation of the underlying benefit request. An original document submitted in response to such a request, when no longer required by USCIS, will be returned to the petitioner or applicant upon completion of the adjudication. If USCIS does not return an original document within a reasonable time after completion of the adjudication, the petitioner or applicant may request return of the original document in accordance with instructions provided by USCIS.
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(7)
Testimony. The USCIS may require the taking of testimony, and may direct any necessary investigation. When a statement is taken from and signed by a person, he or she shall, upon request, be given a copy without fee. Any allegations made subsequent to filing an benefit request which are in addition to, or in substitution for, those originally made, shall be filed in the same manner as the original benefit request, or document, and acknowledged under oath thereon.
