I've packed them in peat before. I would dampen the peat only slightly. Refrigeration would help prevent spoilage...and of course be sure they are able to breathe and get fresh air (no closed plastic lids).
I was told by a buyer a couple years ago to leave any dirt thow them in a grocery bag and in the fridge. Dig for 2 weeks and bring it to them to buy. But that is only 2 weeks.