Frank_Rizzo - 10:09 pm on Dec 23, 2011 (gmt 0)
I traced it to a new server I set up last week. It looks as if I used the home directory of the main site as a transit.
The new server performed wget example.com/various_script_files in batches. As the files were in the transit directory they *were* visible in public_html and thus crawlable and returning a 200 status.
Thanks for the interest.