Abbey of Shapp, or Hepp

I shall be much obliged to any of your readers who can inform me whether the Chartulary of the Abbey of Shapp, or Hepp, in Westmoreland, is now in existence; and if so, where it is. In the *Monasticon*, vol. vi. p. 869., it is stated that in 1638 it was in the possession of Lord William Howard, of Naworth; but though a search has been made among Lord William's papers and MSS. in the possession of his descendant, the Earl of Carlisle, at Castle Howard, the Chartulary is not now to be found among them.