Thanks for the replies. I only need to filter the log files to show the lines for the thanks.asp page. I can create a .txt file of those using the command window.
I've done that already, though, and I don't see any referrers. I don't see any commonality in any numbers in all of the different lines for the thanks.asp page, so I don't know if they came from the same shopping site, if they came in directly, or if they came from Google Adwords.
Adwords isn't showing information in the log files other than simply "Google". No indication as to keywords or phrases.