You are making the supposition that they will have to send it away. Why not go to the store with the camera and discuss it with them. They might have someone that would do a wet cleaning for free and then see what happens from there. Then if the problem re-appears, they would maybe vouch for you with Nikon and maybe lend you another camera while your's is away if it has to go.
Good luck
I have dealt with them in the past. Its a chain store and the tech is in the HQ in winnipeg. Anytime I bring anything in it's a $50 fee and has to be shipped to Winnipeg to be looked at to decide the course of action from there. Of course on warranty I wouldn't have to pay the $50 but they would still have to send it to Winnipeg meaning I would be without the camera for at least a week.
If the spots aren't in the same place all the time, it's not the oil & dust issue, it's something else that probably has a lot more to do with the environment than the camera. People buying D600's have to stop knee-jerk panicking and start thinking.
I really, REALLY have to ask about the environment you're shooting in and how you're blowing your sensor, because if you're doing it right you're not going to lose some and gain some. This is not a camera problem, it's a user issue. How free of dust is the room you're working in? How are you blowing the dust off? If you're holding the camera any way other than face down you're inviting gravity and the blower to introduce problems. Hold it face down and blow across the sensor and let gravity pull the dust away. Then quickly and with the camera continuing to face directly down, close the shutter and install the lens. There's almost no way you'll introduce more dust that way.
Cameras don't have dust issues, rooms do. The D600 did not have a "dust issue", it had an oil issue related to the shutter, which does not show up randomly on the sensor and get blown off but builds in the corners with persistent dust issues developing as it sticks to the oil. You're looking to blame the camera for a problem it doesn't have!!
The environment was a clients house. It was clean and relatively dust free. I made one lens change in the entire shoot.
Then when I did my testing I made sure my lens was clean and yup there was dust. I use a hand "rocket" blower, blowing up into the camera (holding the camera upside down) sweeping across as I pump the blower.
Did this a couple times testing in between until there was no more change in the dust. Now there is one spec in the middle and one in the upper right corner of the picture that looks more like a film then dust.
The only reason I am thinking there is a problem is I have never had issues like this with any of my camera's (Konica Minolta 7D, Nikon D40x, Nikon D7000) or my dads cameras (Konica Minolta 7D, Nikon D70s, D200, D300). And I have less than 500 actuation's on the camera and at the time I started noticing spots I had only taken 100 pictures.
To me that is unacceptable. It's a brand new camera. That said am I really going to gain anything by buying the online one? Or do they all have this issue? I read that the problem seems to go away after 3000 actuation's.