Note that in the examples you mentioned, several items were discovered and then documented.
Note also that if the blade is dated 1845 it doesn't mean that it happened (the curvature) in 1845.
Note also that the issue numbers on the hilt are French regimental rack numbers.
When the French helped foreign states (eg. Poland in the 1920) or supplied trial swords (eg. the USA in the 1830s) it was with regulation French weapons, no custom made swords. In all this cases it was fully documented in governments' archives.
Jean
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