Firstly, because it's easier to send a scan, photocopy or fax, than it is to persuade someone to up-stumps and visit the archives
Simplicity is not the crowning criterion. Professional document examiners analyze original documents. That is what they do, and in the instances where they volunteer their professional services themselves, you can guarantee that they would seek out the originals, otherwise - as all practitioners in this field appear to acknowledge - she would not have been doing her job.
I haven't seen a single compelling reason why copies wouldn't be good enough for the scenario we're discussing here
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