Every oem has got own xp disk which differ oembios.{bin,cat,dat,sig} + precoded options/key in winnt.sif. So it is impossible to get md5sums of those. In theory there could be official md5sums for standard home/pro xp disks, but as you could slipstream spX (and even other hotfixes) it is unlikely to find those. It does not really matter too, when a oem disk from another vendor is used then slp just does not work, but the printed key on the sticker will do. Just ask your neighbor.