>I installed (attached) SQL Server database to the customer SQL server last year (in December). I know they use the application (VFP9) and have added tons of records to various tables since then. Yet when I go the Command Prompt where I placed the .MDF and .LDF files, the date stamp on them is still December 2012. How could it be?

To test the theory if the files are really the one that are used, try moving these files to another place. If you get 'File Access is denied' message, then these files are used. Otherwise there is a copy of these files somewhere else.