We know who does.
One of those two sets went to France! We know this because French fan Audrey and her friends had the great idea to make store display of all the props and costumes they bought from the Battlestar auctions. And what an amazing display it is! This is what makes a fanboy’s heart flutter. You can see the photo of Kat’s boxing gear here in their gallery.
Meanwhile, Kat’s helmet was not among the props auctioned by Propworx. But guess who has it? Katee Sackhoff! As you may know, Katee answers fan questions on a regular basis (“Ask Katee“). When a fan asked her whether she was able to get any Starbuck props, Katee revealed that she’s still trying to get her helmet. They sent her Kat’s helmet, but she doesn’t want that one, of course. You can listen to that comment here.
Related link: Discuss Kat props on the Fanboard