This much is known: rare, medieval Jewish manuscripts have been discovered along the fabled Silk Road in Afghanistan and are for sale.

Are they authentic? Scholars who have examined them say they are.

The rest — who found them, where they came from, whether there are more to unearth — remains a mystery.

But the discovery of the 200 or more documents, some in good condition and others crumpled or in fragments, has excited academic interest around the world....