We got another purr tonight! The little cream lynx point tabby - she was the first one we caught, and when we transferred her that night, I could pick her up by the scruff with no fuss, and sat her in my lap that night and she didn't try to run.
DH got her out of her hidey hole, and took her to the bathroom. She skulked around for a bit, then he put her in his lap and gave her lots of attention, and she was closing her eyes and seemed to be enjoying it. I came in the room and gave her a little pat as well, and a bit after that she just suddenly relaxed. You could see her whole body relax, she half rolled over, and started purring. Her purr was a little stop/start, then she relaxed some more, and purred even harder and non stop. She's a little cutie