AFAIK we have not determined if the original FBI 302 forms still exist.
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I’m not sure how it COULD NOT still exist. If it was composed on a computer and forwarded up the chain via an email attachment, than that email would exist in an archive somewhere in the FBI’s systems. It should also be recoverable from the computer of the agent who composed it. And on the computer(s) of the person(s) who received it and revised it.
Goodness, they’re the FBI. Certainly they have digital forensics experts who know how to retrieve those items. Unless, of course, they simply don’t want to “find” it.
should....
I seem to remember claims that Hillary's emails, Strzok's phone texts, and DNC server data "disappeared."