Lost my I-797A form and need to apply for OPT at the earliest. Can I file FOIA and use its response for filing of OPT?
Multiple repeat questions on the same issue. No. Cannot. Again, talk to your school's DSO about this. Once you file FOIA will most likely obtain a copy of the missing Notice of Action. That's what you'll need to use. Not the FOIA filing receipt!
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Although as the requestor, you can file a FOIA request, this may not be the best mechanism to achieve your goal. For example, a "lost" I-797A that never made it to the USCIS will not be available through FOIA because, as you stated, it was lost.