Itunes Library that I swapped in after switching to new PC is out of date, missing ~3 months of added music

Hi,
I just got a new PC laptop (replacing a dying one) and transferred my Itunes library to its C drive from an external drive, and copied the Itunes Library folder over as well so that I wouldn't have to recreate playlists (and, more importantly, redo all of the checking-and-unchecking to make my chosen library fit on my 160GB Classic).
When the library first populated, I was very happy to see that checks-and-unchecks seemed in order, but then as I was syncing the Ipod to the new computer I realized that the library file must be out of date, as two or three months' worth of additions don't seem to be in there (even though the Library file says it was created on July 20).  Is there anything I can do to find the most up-to-date library file on the external drive and put it in place on the new laptop?  It's weird - the newer songs themselves are in the new Itunes Media folder, but they aren't showing up in my Itunes library unless i re-add them.  This, and the fact that the last sync added stuff that I chose months ago to remove from my Ipod so as not to run out of space (I'm in the last 1.5GB or so), is very frustrating.
Thanks for any help you can give!

Search for all files of the form *.itl. The most recently modified one will be the active library. The one before may be the library that was most recently active on your previous system.
See Empty/corrupt iTunes library after upgrade/crash for tips on how to switch the library you want to access into the correct location.
tt2

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