I feel if the OP, can should the tracking status of his mail. They should be safe.Under most States' Laws a letter is presumed delivered on the Date of Mailing. So long as you keep Proof of the Date you mailed it you should be ok.
I also hope the OP, make a copy of all the documents and his rescinding letter to the timeshare developer. The OP, needs to keep all of their documentation for their proof to cancel the timeshare purchased.
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