I understand that you are worried, but you are not going to lose your home and job just for an arrest, and there's no reason at this point for you to think you will be convicted.
The state has until the statute of limitations runs out in order to press criminal
charges against you. Unfortunately, however, NC has no statute of limitations on a felony charge, which means they can take as long as they want before arresting you. But if you do end up arrested and this is your first contact with the criminal justice
system, you will likely be left at liberty while you fight this case, as it's a non-violent
crime and you have roots in the community. Your defense to this would appear to be that you're the innocent victim of fraudulent enterprise, and as this sort of thing has become a huge problem, that may be a very viable defense.
So the best thing you can do for now -- and I know it may be easier to say than to do -- is to just go on with your life. The longer it takes for anything to happen, the more likely that you will be all right. Just make sure you do not discuss anything about the job to the police or, for that matter, to anyone other than your lawyer. If the police contact you wanting to talk, tell them that you'll run that by your lawyer and get back to them. Then call him and follow his instructions.
As for the computer, your lawyer can bug the police about the computer, but as I more or less indicated earlier police can keep the property under a couple of circumstances: 1) if it's the fruit of a crime (stolen property) 2) if it's the instrumentality of a crime (the means by which you allegedly committed the crime; 3) the prosecutor needs it as evidence; So depending on what they find, it may not be just a matter of copying the hard drive.