I'm trying to understand what you are saying. I'm hardly an expert on Toshiba OEM Win7 licenses. Heck, I've never even SEEN a prebuilt PC with Windows 7. But I have a difficult time imagining that if I insert a Retail Win7 disk into my old Toshiba PC it'll automatically acquire a Toshiba preactivation Key.
If your system was preinstalled with Windows Vista, and/or has the appropriate BIOS SLIC table for OEM preactivation, you can use
ANY Windows Vista install disc as long as you have the correct OEM certificate .XRM-MS file and generic OEM SLP installation key. It could even be an upgrade disc, but it will still function as an upgrade disc.
The correct OEM certificate .XRM-MS file can either be scavenged from the system drive or obtained from another source (such as another system of the same brand that was preinstalled with the same edition of Vista), using a utility such as
Activation Backup and Restore (ABR) for Windows Vista (does
not currently work with Windows 7, the author of ABR is currently working on a Windows 7 version). Or it could be downloaded from 'the net'. ABR will simply install the .XRM-MS certificate file and product key (as found in the .TXT file that was created during activation backup), both of which should be located in the same directory as the ABR executable. After restarting the machine, Windows will be activated.
Windows 7 mostly uses the same OEM activation scheme, with some differences. As of yet, I'm not aware of any handy utilities that will automatically backup/restore the required OEM activation files and insert the OEM product key. See:
http://forums.mydigitallife.info/showthread.php?t=7126 (sections F-a and F-b describe manually installing the certificate and product key)
OPATool v0.7 can be used to automatically install the certificate and product key after installation of Windows 7 (but cannot be used to backup this information, it must be supplied manually). As with Vista, any Windows 7 install disc will work since the product key and certificate files are being loaded after installation, not during, as long as the same edition is being installed (e.g. Home Premium, Professional, Ultimate).