There should be serial #s on them. If not you are out of luck, unless you know the make and model of these laptops. then you can make an estimate. That would be about it.
Now here is the real answer. It does not matter what they are, for they are worthless. If it is from 2003 can only be a single core, and very slow at that. If it is from 2006 it could be very slow single core cpu, with a good chance of being a very slow dual core Pentium D. Again worthless.