IPhone :: Figure Out If Brand New 3GS Is Unlocked

I will be going overseas soon to Asia and a friend over there is requesting we get him an iPhone 3Gs and he will pay us back when there.Now, my friend over here, his sister just received an iPhone 3GS. She does not want it. It was a gift from an admirer and won't take it back. They are now going to just sell it and take the money.So my current situation is this, I currently have the iPhone box, sealed at my house. The box displays IMEI and some other information stuff. What I don't know is if the phone was bought from a carrier like Rogers/Fido or from a reseller store or something. The friend overseas would like the phone to be brand new and sealed. Also he would like the phone unlocked so he can use it.Problem, is there a way to find out through IMEI or somewhere on box to figure out if the phone was bought from a carrier? I've never bought an iPhone from Rogers/Fido so don't know if there'd be a logo or something somwhere on box. As of now there are no indications somewhere saying it is from a carrier. My friend over here also thinks it was not bought at a carrier. We can't really ask the original guy who bought it because of whatever issues too.So yeah, if anyone knows if its really easy to figure this out or something, please let me know.