I think the default place for access logs is
%SystemDrive%inetpublogsLogFiles
Otherwise, check under IIS Manager, select the computer on the left pane, and in the middle pane, go under "Logging" in the IIS area. There you will se the default location for all sites (this is however overridable on all sites)
You could also look into
%SystemDrive%WindowsSystem32LogFilesHTTPERR
Which will contain similar log files that only represents errors.
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