Do you know if the License Key has been registered or if the software was purchased directly from FileMaker?
It may be more beneficial to contact the Customer Assistance Department at 1 800 325-2747 (choose option 1 in the phone menu). The Customer Assistance team will be able to search for registered License Keys and is probably the best source for information for this type of issue.
If you are not in the US, go to www.filemaker.com > Company > Contact US > View a list of worldwide offices and then choose a region closest to you. The numbers for that area's Customer Assistance will be listed on the web page.
Let me know how it works out.
I'm in the same boat, I checked with Filemaker and they said they see that my company regisitor the software but they didn't have the install code recorded, is there anyway to get it out of the installed program, I'm using File Maker Server 6.0.