I keep returning to the March 13, 1977 NY Times interview with Anne Locke Packard (
https://www.nytimes.com/1977/03/13/...ekly-a-grieving-mother-finds-hope-in-art.html) because it seems to contain the most detail about the case, even if the departure date is questionable. I'm wondering if Stephen and Linda left from his home in NJ on Saturday, June 1st. Could it be as simple as a typographical error? They actually left on June 1, but in error it was noted as June 10, which was not a Saturday, but a Monday.
Also, Anne Packard says in the article that Stephen sent postcards every 3 days, but "after 3 weeks the postal cards stopped coming." It notes that the last card was mailed from Westport, CA and that's where the traveler's check was cashed. This article doesn't specify the postmark date, but I'm pretty sure the traveler's check was cashed on 6/20 according to other sources I've seen. If the last post card was also sent on June 20th in Westport, that would be just a day shy of 3 weeks if they left NJ on June 1st. That date would have given them time to hitchhike cross country.
I am curious, too, about their activities once they reached Stinson Beach. What kept them so occupied that it took 10 days to get from Stinson Beach, CA to Westport, CA, assuming that Stephen mailed the post card and cashed his own check in Westport? Obviously, there's no way of knowing that, but one wonders whom they met, or if theres a possibility that they were traveling with others. I'm just so glad that this thread is active again. And grateful for the articles ohthatkatgirl is finding!