With only 6 months left on the warranty, should the watch need warranty service, I would think the bill of sale from the AD should be enough to prove the original sale date. The RSC could take it from there.
Papers are lost in fires every day in this country.
It shouldn't be a deal breaker. Tell the buyer you will attempt to make an effort to get a replacement but check with your AD first to see if it's possible. Good luck.
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