I received my 3rd trade this year of dried out unrooted cuttings yesterday. Everyone is making the same mistake. Here is how I send unrooted cuttings. This method works and mine always make it to their destination hydrated and fresh even if they are going across country.
First I water the plant that the cuttings will be taken from the night before.
In the morning I take the cuttings, at least 6 inches long.
I cut off ALL the leaves except for any at the very top of the growing point.
I then take a slightly more than damp but not dripping paper towel and lay it out.
I put the first cutting on the paper towel and fold it over.