We only have a single account of a Morgul-knife being used, and so dating their origins is difficult. It is notable that Gandalf was evidently familiar with the knives and their characteristics, so they had clearly been in use for some time before the War of the Ring. In principle, they might have dated back to the time that the Nazgûl were first ensnared by Sauron and turned to wraiths. This would place the making of the first Morgul-knives as far back as about II 2250, more than four thousand years before Frodo was stabbed by such a knife on Weathertop.
All of the Nazgûl were destroyed in the final battles of the War of the Ring, but at least some of their knives might conceivably have survived that War. For example, when the Witch-king was slain and vanished, his gear remained on the Pelennor Fields, and a Morgul-knife would possibly have been part of that gear. If any of the knives did survive the War, however, no Ringwraiths remained to wield them.
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