I just spoke with this caregiver and she was able to get a letter from her TC and her cat was released.
However all the concerns raised are still worrying. How long will the cats be held for? I am sure that they still need to be held for a certain number of days at least, which was what happened in the past - but how long? Will that be affected? What if as someone said, the TC cannot be contacted?
I am not sure what brought about the policy change which is why we need to find out.
The best thing though you can do is to contact your TC and let them know that you are the caregiver there if you have not already done that. If the TC has an arrangement with you, then the cats should not be caught in the first place - and if there is a mistake, they should write you a letter.