We buy 3 packs of OEM disks at work all the time, I'm 99% sure they must be the same as what you have. Brown box with red Microsoft seals on and a white label on the end?
You get a piece of card moaning about Service Pack 2c, compatibility issues and something about the OEM preinstallation kit and three cellophane wrapped XP Pro Manual + Disk with a license sticker attached to each.
They install just like a normal XP disc and work fine. The activation process does seem to have been wonky lately. Flagged up a brand new license as having been activated 5 times the other day, so you may have to go through the automated telephone process.