Maybe I missed something, but in the episode it showed Maggie in the railroad car look at her pocket watch given to her by Herschel. Is that the watch (or a similar one) that Rick thought he saw on the Terminus guy that started the whole brawl?
Yes, Rick saw several items he recognized: Hershel’s pocket watch, Glenn’s riot gear, and Maggie’s poncho. Rick kept it as they got herded into the train car. It wasn’t a weapon, so they kept it when they were entered the train car.