Technically,Montvale can't tell them whom may view out of date service records.
Lots of Stealers play the "Privacy" game.They figure if you can't figure out when last it was serviced they can "Sell" you the service Now.
A Service Advisor (Unless he/she's cohabiting with one of your family) will never
voluntarily give you previous records.(They see it as money out of their pocket)

Approach the Service Director (Or the Franchisee) and ask.

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'84 300SD sold
124.128