TheSayreShellie: Sorry folks, this one has to be archived. I had confirmed that it was missing with my 9/19 visit & post. I never heard back from "PennDot" about whether there is a new policy against caches at rest stops, as some searchers have claimed.
However, I did read the big ol' sign of rules here clearing stating that the rest area is NOT to be used when "closed" signs are posted. And that is a significant amount of time. And I'm also aware of proposed state legislation increasing fines if certain such "control" signs are ignored. So better to play it safe...have safe traveling, folks.