Yep all is well. I checked the box which was probably something like 10" x 36" x 30". It was big. The heat packs were wrapped up in news paper so they didn't touch any plants directly and tossed them in. The plants didn't budge but the newspaper was pretty moist! But they were in the box for maybe ten hours at most.
Now the trial begins...fitting these but Vandas in my grow space and keep them from shriveling up!!!!