-Found the very interesting article you referenced, Jmoose - Re: Cotta cold case: Wall Twp NJ Police interviewed 250 people in 4 or 5 states over 2 years, in 2007 (34 years after she went missing) and there is a reward for information for her 1973 MP case. --It really makes me wonder what does it take to open a cold case?
Sylvia had several groups of peeps when she went missing. -Makes me wonder was anyone contacted at Wagner in 2010 when her brother tried to get the case opened? And the other groups? -Family, both sides, friends, HS, teachers, neighborhood, etc... Wagner & Sorority peeps would have been among the last to see her alive.
I have had and still have a sense the BF/F provided cooperation and some kind of proof of whereabouts in both 1975 & 2010 which is why he is not been named a POI - but he can certainly be found if they find new information or her body.
We know there was a party at Sylvia's house with her peeps, but no BF/F, a week or so before she went missing. Were those people tracked down and interviewed in 2010? This echos your Q about does someone know something???
Look at how detailed the article is about the Cotta MP case. -I so wish there was this kind of transparent investigative effort for Sylvia.
http://starnewsgroup.com/weekly/2007/03.29.07/pdf/03.29.07.pdf