Our fids are generally a bit peeved when we go away (odd weekend, week vacation every other year). Merlin & Stryder (Grey & tiel) are generally ok within a few hours of us returning.
Rosco, our caique, has his glaring eyes on me when we initially return, so I generally don't handle him the first day or two. Once he realizes I'm not leaving him other than the go to work (normal routine), he goes back to his normal self. He really is the one to deal with change or sudden events the worst out of our trio.
Our Grey and Tiel were acclimated to a lot of changes during their younger years, so anything (i.e. vacation, moving), doesn't really bother them.
We did have the fids at our inlaws for a month while our floors were being redone (that was a fiasco, hence why they stayed a month), and Rosco was peeved to be in a) a smaller cage, and b) that I wasn't there for his normal things - the crazy white haired man was

(I love my in laws

They REALLY do love our animals). So the nights that we did stay at the in-laws, Rosco and I would hang out in the bathroom while I bathed, and he just walked along the side of the tub quacking happily away eating his grapes. He still didn't enjoy the whole experience, but we dealt with it.
So I'm going to say you may have to go from the ground up with your new Caique when you return. Don't expect any trust to be there on his part, and be patient with him when you return. Lots of food reward will go a long way with him when you do return. Rosco would do ANYTHING for a treat

.