Everything went perfectly. The package was waiting for me, as expected. All of the Berghia were visible and active. After the drip acclimation, they are now in my tank. I watched as they crawled, from where I placed them, into the rock work.
Berghia arrived safely and healthy this morning, all three seem to be doing great, crawling all over the place at first. I see what you mean about them liking the creases in the plastic shipping bag. Hope to do business again.