Initial failure, followed by success due to persistence.
I called Hagerty, spoke with a telephone representative who "spoke with her manager" and she informed me that it wouldn't be possible for them to contact the current owner because they "have no ability to search for vehicles by the VIN"! I choked back my laughter and thanked her politely for looking into the matter.
The next day I called Hagerty's corporate headquarters and spoke to the Concierge. I somehow failed to relay the previous day's conversation. The Concierge instantly understood the validity and rationale of providing the current owner with the voluminous 30 years of records, including the original window sticker, original invoice, original checks used to pay for the vehicle, registrations, smog checks, service records etc.
He was extremely cordial and helpful. He volunteered to contact the current owner, if they indeed had Hagerty insurance, explain the existence of this material, and provide him or her with my contact information, leaving it up to the owner to contact me if desired (maintained customer privacy).
Within one hour, I was called by the current owner (functionally the car's second owner but technically the car's third owner, who purchased it pre-restoration from the person (unknown to me a restorer) that purchased the car from me).
I can't fault the telephone representative and her manager. They probably never encountered such an unusual request. I knew that personnel higher in the company's hierarchy would be able to process it more sensibly.
Long story short: the current owner also lives in Northern California and will meet me this coming week to pick up the heavy binders! He is more than happy to receive this obviously unexpected surprise.
Thanks everyone for your suggestions, etc!
