Sorry, Jack, but I don't think he uses them anymore. Look at the photos from Getty images in the below link. Those are not E21 stickers and when Boo did use the E21 shafts he didn't have any stickers on his shafts.
And E21 doesn't PR his wins anymore, either, so that to me also indicates he has moved on. The only one I'm aware of using the shafts anymore is Vijay.
If E21 does a PR about Boo and the Ryder Cup I'll happily admit I'm wrong.
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