Welcome back to the US from me and my boys too! I'm sad that is hasn't gone as smoothly as you had hoped. Poor Boo and poor you! I would be quite irate at the whole situation as well. Perhaps you can purchase some feliway (either the spray or the plug-in) and put it in a small room where you will be keeping Boo once he arrives for the first day or so. It should help calm him down if he is frazzled from his journey. Catnip is also a good option! Good luck collecting Boo soon!
**hugs**
Karen