Just out of curiosity, does it really matter if the watch is not fitted with the Parachrom? Also how does one identify if ones watch is indeed fitted with the parachrom hairspring? The colour blue? Well, the parachrom hairspring was introduced in 2000 and it was not blue in colour. Let's enjoy the watch and not get caught with the technicalities. 

My 2 liners cal 3000 is running within COSC spec.
Mine is running on COSC specs as well.
I think most rolexes on nivarox spring is just fine.
Wouldn't hurt if it comes with parachrom blu though.
I am not sure if the premium is justified.
There is a way to get a parachrom blu in my watch, just purposely damage the current spring in my sub, send it for repair and Rolex will replace it with a parachrom blu.
I have no idea how much it costs but the parachrom blu can fit in any existing rolex movements with no problems.