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@pip
Buy new bearings if you're overhauling hubs. Bearings cost bugger all.
If you have the original bearings in the hub, they may be in a retainer.
Just count the number of bearings on one side of each hub. Pop one of the bearings out and take it to a shop to get the right size, if you don't have a way of measuring them. Can't remember what size Campy uses off the top of my head, but its likely they have something like 1/4" bearings in the rear and 7/32" in the front for record hubs.
Bearings come in different 'grades' as well; the grade measures the roundness of the bearing. Ideally you'll want to get Grade 25/50 bearings but most shops only have Grade 100. Try and avoid anything above this.
One nice cheap present to yourself is something like this, which is a really quick way of measuring bearing size. Handy for wheelbuilding too etc.
If you're going to ride these hubs a lot, you really should get good at overhauling them (at least once every six months) and you can buy bearings in bulk to really make the cost of the overhaul miniscule.