I'm amazed that they were even sending plants from the UK at the moment as most places aren't even sending Uk to UK even. The postal system here is definitely in a mess at the moment so I wouldn't recommend getting from here again. I expect the post is affected in US as well. Some plants are tougher thaan others as this experience has shown? I'm amazed actually that anything surviveved that long in the post and dobt it was anything wrong with your tank or you. I have mainly Java Fern and mosses and suspect they would survive nuclear war, I can't kill them anyway however badly I mistreat them and am always giving some away to friends as it spreads?
You could try again but I wouldn't bother with gettig them abroad definitely, any time soon? I am awaiting the postal service to get back to doing next day delivery here so I can get some shrimps but I fear that may not even hapen this year, d'oh!
Just as an aside, I used to attach plants with fishing line, now I use glue, OMG would never go back to tieing when 1 dab of glue and your done, soooo much easier - needs to be non toxic/aquarium safe of course and is more expensive!
Simon