On Sun, 24 Mar 2013 18:07:50 -0700 (PDT), bob haller
wrote:

Could they tell from the location?

Not EXACTLY, the area is littered with all sorts of debris from a
lifetime of launches.

Yes, but we are talking only about Saturn F-1s. Is the location of
where each SI-C went down known accurately enough to tell which ones
have been found?