I checked on my thunderbolt equipped MBP (late 2011 model) for any thunderbolt files and found nothing using spotlight.
I found the following in Finder Help with the only reference to thunderbolt software files being those that come with specific external devices. Note the third paragraph:

There have been these updates and perhaps this is what you are referring to:
http://support.apple.com/kb/DL1544
http://support.apple.com/kb/DL1612
Note that these are for Lion, not for Snow Leopard which you indicate is your OS.
In order to assist you it looks that I would need more information. As I see it, my original response is correct. If not I would very much welcome information why I may be wrong. My purpose on these forums is to help when I can and learn as much as I can.
Ciao.