[JaimeS]

It is normal for a tiel to be scared, quiet, and not move around much or eat or drink for a bit. I would be concerned that he hasn't pooped though. If he is perching that is good.

It is always a good idea to take a new bird to an avian vet to have him/her checked out. Especially if (as it sounds) the circumstances he came from weren't the best. I would get him an appointment asap.

Congrats on your new friend, tiels are an absolute joy!