Searching for file within Time Capsule

Mavericks OSX 10.9.5. I need to locate a file in the Time Capsule. I can navigate into the directory I want to search in, and using OSX find, I can "search" for a file that is right there and there are no results.

For example navigate to directory Website containing two or three files including index.php and search for "index.php" yields nothing.

I think that I'm not actually navigating to a directory, but that the OS is displaying a virtual directory based on the Time Capsule database.

How does one search for a file within Time Capsule backups?