44Burke, Cormac. "A Crozier and Bell from Inishmurray and Their Place in Ninth-Century Irish Archaeology." Proceedings of the Royal Irish Academy. Section C: Archaeology, Celtic Studies, History, Linguistics, Literature 85C (1985): 145-68.
According to Patrick Heraughty, "We know from the detailed account book kept by Walker from 1836 to 1845 that he paid £2.00 to Underwood for the old bell on 26 January 1842. Most likely the bell and crozier were acquired together by Walker from a local person." (Heraughty, Patrick. Inishmurray: Ancient Monastic Island. Dublin: O'Brien, 1982. 38.)
From an article on Roger Chambers Walker we learn that his museum included "dug-up, purchased or swapped items. Much of the collection was found locally or came from throughout Sligo including the island of Inishmurray...Some items were acquired by devious means while collectors vied with each other to outwit each other in the acquisition of choice items." From the abstract of this article, the author states: "Walker combined the life of a landowner and landlord with that of a barrister. Added to this he combined the role of antiquarian looter in the adjacent Carrowmore area and collector of antiquities." (Ireland, Aideen M. "Roger Chambers Walker: A Sligo Antiquarian." The Journal of Irish Archaeology 11 (2002): 152.)