xp registration help

ok, so we have 5 computers each with their own copy of xp, unfortunately we
have not marked on the cd's which copy goes with which computer. we are
giving away a laptop and would like to give the cd with the computer. how do
you tell which copy goes with the computer?

i have checked the registery, system info, etc. and do not find a number to
line up with the number on the cd package...

any help?
.

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