Why would an internet connected spy camera be bothering to store anything locally. If only because its limited local memory would soon fill up.
If I were to hazard a guess, I would say it probably stored the content locally until whomever owned it connected and downloaded it, then erased the files freeing up space for more videos.
Even though it was connected to a router and ethernet card, there's nothing mentioned about a CPU (computer) that could be programmed to automatically upload to an account/FTP server.