First off, a 1 week QT is not long enough. Unless you really, really trust the person you got the snake from. Then, some would say, not even then.
As for the reason your snakes went off their feedings, who knows. They can go off for no reason at all. I bought a 700+ gram albino, that was eating every 4-7 days. She was packing them in. She went into shed, and hasn't eaten since. That's been 5 weeks ago. All you can do is to keep offering food.
Good Luck!
Jim Smith