Boeotian horsemen 4th century BC

[hoplite14gr]

Agree that Xenophon had seen the contemporary Persian cavalry
Yet Pausanias describes that at his time (1st A.D.)that during Hyakinthia the ancient armor of a hero was paraded in Amyklae.
The conquest of Amyklae is dated between 900 to 800 B.C.
Pausanias decribes other similar items in Delphoi.
If Pausanias could see itmes so old why not Xenophon too?

Kind regards