all files
That would be a lot of unnoticed upload traffic.
(using the camera of your device)
Tape is cheap people. Removing the entire camera device is pretty easy too.
history of viewing sites
Browser's can be set to not save that. You should do that now. The world becomes a worse place when people choose convenience over privacy. Even if you don't feel you have anything worth hiding, if you normalize anti-privacy behaviors you entrench those values deeper into the culture and everyone is made less safe.
The entire email is written so broad as to include mobile/laptop/desktop devices using any OS. This makes it feel hard to believe.
I just hacked this router and placed my malicious code on it.
I recommend everyone to consider their router hostile anyways, it almost certainly has proprietary firmware (and closed source hardware) and was produced in a country that is required to submit to some level of dragnet surveillance and opening up back-doors for wiretapping targeted devices.