This would be a huge win for that BTC owner, I can't imagine how he would have managed to control his emotions till now, and why would he think, the current time is good to move or convert funds into Fiat. Well, there would be another possibility that the owner found his wallet key that day

if that's the case then he is the happiest person in the world.
Talking about the market, I am confident about it, because it has a huge capacity to consume BTC, and IMO these 2,352.62 BTC can be digested by the market easily so the market might not be highly volatile.
PS: I hope the owner won't book any profits at the current price, as BTC has more potential to grow.