As opposed to manually trawling through thousands of documents, based on a keyword that may, or may not, appear in the context of the case file? It's a huge bo

As opposed to manually trawling through thousands of documents, based on a keyword that may, or may not, appear in the context of the case file? It's a huge boon, but nothing is perfect. If it's that important that absolutely nothing is missed, maybe try multiple approaches concurrently. Take this as a value add, not a replacement.