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If the machines you are looking at haven't rebooted since they first called home, they wouldn't be aware of any other events (like user authentication). Have you confirmed that the clients in question have rebooted at least once?
If the environment behind that NAT is large enough, you could always put another server on that network. If possible, you could even create a VPN tunnel between the two networks for either SMB mapping the secondary server to the SBDATA of the master or allowing a non-NAT'd path for the clients to get to the server.