Hello Averil.
I saw the three William Corkils (one Arch) in the MM indexes which were filmed by the LDS - the index which Brian later transcribed by extracting the names from each parish, each year, and putting them into an alphabetical index. As he wrote: "This index has been prepared from the official indices in the Archdeacon's (LDS film 0106195) and Episcopal (LDS film 0106366) Registries. A total of 54,890 Wills, Decrees and Agreements have been indexed".
These are a small section of my notes from LDS Epis film no.106366 (before they added the "0"), from around the time you are looking at. I copied only the ones of possible interest to me.
1672 Ramsey & Maughold
Joney Christian Will
1672 Maughold
Mary Corkil Will
1673 Maughold
Willm Christian W
Margt Corkil W
1673 Lonan
Henry Skillicorn W
1673 Ramsey & Maughold
Daniel Corkil W
1674 Maughold
Wm Corteen Will
Philip Christian Decree
Joney Stole D
Henry Corkill W
Christian Cowle W
Daniel Joughin D
Ann Sayle W
Cath Brew D
Wm Corkle D
Isabel Corkill D
1674 Andreas
John Sayle Contract
1674 Lezayre
Mr John Christian of Milntown
1674 Maughold
Isable Corkle als Cottiam
Ann Xtian
1674 Andreas
Margt Sayle als Cowley
1674/75 Lezayre
Ewan Xtian W
1674/75 Maughold
Margt Xtian als Kerruish W
1675 Lonan
Ellin Skillicorn als Louny Decree
1675 Maughold
Wm Xtian W
Wm Cowle W
Willm Christian W
Robert Corteen W
John Xtian D
Edmond Corkle D
1675 Lezayre
Wm Christian W
1675/76 Maughold
Margt Xtian als Ayrcough? D
1675/76 Andreas
Cath Joughin W
1676 Lonan
Cath Skillicorn D
1676 Andreas
Micks? Xtian D
1676 Maughold
Margret Corkil als Creer W
William Corkil D
William Corkil W
1677 Maughold - part torn off
1677 Maughold
Ewan Corkil D
Xtian Kirmin als Kalfale? W
1677 Andreas
John Brew W
1678 Andreas
Charles Cowle W
"Finis" (of section)
If you want to double-check, the LDS film numbers are above.
I think Frances's message about the missing bundle is probably the answer.
Sue