Avoid Submitting Fake Documents
First and foremost, don't even think of submitting fake documents for any purpose anywhere.
Steps to Reapply for Credential Certificates
Secondly, you can reapply for your credential certificates even if you are unable to recall your roll number or any relevant detail. Just file an FIR, take a copy of the acknowledgment, then write an application for re-issue directed to the head of your institute where you pursued your schooling. You can easily retrieve all your data like roll number, certificate number, registration number, etc. After that, reapply to the board along with all the data and an application stating the reason for re-issue. There will be a charge for this process; for CBSE, they charge around 500 INR. What's important is that you will receive a copy of all the documents. The whole process should take less than a month.
Reference Links
See the following links for reference:
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http://mycbseguide.com/blog/how-to-g...ate-from-cbse/ - How to get Duplicate Certificate from CBSE | A Complete Guide for CBSE Students
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http://cbse.gov.in/faq/dup.htm - Guidelines
Hope you get it soon. Keep it safe for the rest of your life. It's better to get it scanned and keep copies everywhere like I did - on my mail, on SkyDrive, on my phone, and on my laptop, as it allows quick forwarding in case of need.
Good day. Take care.