I shipped a box of corals from Central coast CA to Vegas. I packed 12 in standard bag/water. I put 4 common SPS frags, all actively growing, into damp paper towels. They were tucked in among the bags for better insulation and a heat pack was taped to the top of the styro box. Transport time was less than 24 hrs. All but one of the 12 is doing great, and none of the 4 shipped "damp" survived.
I may try it again when the weather is better, but not too promising thus far. In all fairness, I may not have had the paper towels wet enough. They were wet, but by no means soaked.
HTH
CAReefer