Congratulations on your new gun! I have the exact same model and it's one of my favorite guns, and certainly the most accurate semi I've owned.
The roll stamp on the barrel will tell you where the parts were made. Mine says north haven. New ones say illion. The serial number counts back from 2100, for example mine starts with 91 so it was made in 2009, 92 would be made in 2008 etc...
Here's the grey area... When CEREBUS bought marlin they moved a pile of guns, gun parts, and machinery to the Remington plant in illion, and remingtons distribution center in Madison NC. So the only way to find out where your gun came from is to look at the shipping label on the end of your box the gun came in. But even that is conveluded, because your gun could have a north haven roll stamp, serial number starting with 92, and still have come from either Illion NJ or Madison NC. Because the marlin built gun may have been boxed up there, or it may have been assembled from old marlin stock there also. The only sure way to know is if the box says north haven on the shipping label, but I'm doubtful that it will. Most of those got snatched up pretty quick.
My personal opinion is that if your serial number starts between 91-99, and has a north haven roll stamp, it was more than likely built at the old plant and shipped to the new plant before being boxed up and sent to a distributor.
If the barrel says illion, and you have a serial number starting with 90 or 89 etc... It's a remlin.