Personally I started sh**tting my pants when I saw the early Virginia returns. I imagine they knew at least by then or more likely before.
Don't know how many elections you've watched closely. But eventually you'll watch enough of them to know exactly how Virginia counts....and you won't be fooled by VA early returns again. There's no other state like it out there. The Republican areas always report early and the Dem areas always report late.
No other state has such a strong and consistent tendency to give misleading early counting results.
Even given that NOVA comes in late, Trump's numbers in other parts of the state were phenomenal. He was turning light red counties from 2012 into deep red counties. The math from what would need to come in from the late returns started to look really sketchy.