I have some 1800 contracts indexed - most from Deeds (not all are identifiable as m/cs from the index so no doubt a few more to be discovered however I've looked at all Old Deeds (ie those before 1723) - I have now put the new indices to Episcopal wills on line so you can check if any wills there which were not in the poor index transcribed by BL.
The key place to look is I suspect lib vas but my own feeling is that as it was in the inventory the document was held by his wife and probably not in any repository.