I actually had one of these logs on our 'Show Me the Quail cache'.  I 
got over and checked it out today.
There is no cache entry by the team in the log book. (And still no Quail!)

>From: Tim Giron <tgiron@cox.net>
>To: listserv@azgeocaching.com
>Subject: Re: [Az-Geocaching] for the stat worry people
>Date: Wed, 28 May 2003 14:51:44 -0400
>Reply-To: listserv@azgeocaching.com
>
>Perhaps he just has a different interpretation for the "SL" portion of his entries; some possibilities:
>
>saw log
>
>sawed log <- any fresh cut wood nearby?
>
>sold log <- not likely since they appear to still be there
>
>smooched log <- Ewwwww!
>
>signed lightly
>
>sighted legumes <- not likely at every cache
>
>surfed LaJolla <- perhaps a crowning moment in his life
>
>Tim
>Team AZFastFeet (headed for the last page of the stats!)
>
Actually, on the logs on our caches, he/she/they always put TN/LN/SN. 
 At first
glance it looks like the standard tag line, but they actually use SN as 
in 'Signed Nothing'.
I really can't imagine the motive behind going and locating a cache, and 
then not doing
the cache owner the favor of writing a few words to commemorate the 
visit, even if it
is only just your team name.  In looking thru our logbook I saw some 
cards inserted in
the log book, team Sprocket has a nice rubber stamp you can't miss, and 
someone
hand wrote some slips of paper which they dated and left in the log.  I 
liked them all.
If the team in question is reading this, please reconsider logging your 
finds in the cache
logbook.... if not to have a complete history for the cache, please do 
it to give something
back to the team that hid it.

--
Jim - Team 8 Feet