Sounds like everybody/birdy had a WONDERFUL visit - and, yes, you are right, they never forget but I have found that, if they think that their current home is better than the one they had before, even though they do remember their previous owners, they don't really want to go back with them.
And, Wolf, welcome to the club of the 'not so happy with all the birds spouse'! I am the president and you can be the VP

I got into hot water this weekend because of a new little one that came in -will tell you all about it on its own thread.