"Several week back-log"...That sums it up right there
I wouldn't worry if its been received, your already stating that its been signed for...received.
It takes time to respond to all service calls/requests, and it also will take time to diagnose/repair the watch.
Ed stating to you that he has a several week backlog would also cover the fact he hasn't had time to respond.
No need to worry, he'll contact you soon enough
