So how about maybe adding rules for auth_basic failures ?
I see two kinds in the log
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2013/04/04 15:02:03 [error] 7882#0: *161 user "sdfsdf" was not found in "/blah/.htpasswds/public_html/blah/passwd", client: .........
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2013/04/04 15:23:42 [error] 7882#0: *163 user "superuser": password mismatch, client: ...............