Why parts discontinued decades ago can still be found
An OEM discontinuation does not remove a part from the market overnight. Surplus lots, parts taken from retired equipment and regional distributor backlogs continue to circulate in small volumes. The real difficulty is not whether a part exists, but whether its condition can be confirmed.
Confirm silkscreen markings, version and firmware — a matching part number is not enough
Ask for photos of the actual unit and a serial number; "warehouse photos" are not acceptable
State new / refurbished / pulled clearly, so that price and risk match
