It's a brand new, box - packed XP OEM. Please share your views!
An OEM license is technically tied to the motherboard. So as long as its new, it should be no trouble. But it cannot be moved to a new motherboard according to MS OEM license.
As to whether you are "technically" allowed to use an OEM licence. Even MS doesn't give stright answers on this question. Here is a good article on that topic.http://www.zdnet.com/blog/bott/is-it-ok-to-use-oem-windows-on-your-own-pc-dont-ask-microsoft/1561
And that doesn't even cover the potential right of first purchase issues.
Bottom line, it should be no problem using a new XP OEM.