Would all Writs of Diem clausit extremum have resulted in Chancery Inqs or would some have just been dealt with locally?
Sometimes the writ expired before it was dealt with; sometimes it went missing at some point. The writs were supposed to have been sewn to the inquisition when it was returned to the chancery. However, not every piece of documentation survived. Some IPMs were organised locally without a writ. I have seen a number of instances in the printed calendars where it states that the writ is missing. For those who held lands in a number of counties, it would be unlikely that all the writs have disappeared.
Since these IPMs would usually only take place where the deceased was a tenant-in-chief, this might explain what seem like omissions. If someone else held some of the tenant-in-chief’s lands – a sort of ‘sub-tenant’ - then there would not be an IPM for any of them when they died, unless they also held lands in their own right as a tenant-in-chief. But they might be mentioned as holding the lands of the tenant-in-chief within that person’s IPM. So you'd have to read through the text to find reference to them.
The Duchy of Lancaster IPMs are filed in a separate class (DL 7). There are some strays in the Palatinate of Lancaster class (PL 4). Palatinate of Durham are in DURH 3, while Cheshire IPMs might be found in CHES 3. It is also possible to find some in the Exchequer records (E149-50).
I did read somewhere that the escheator remained in office until a new one was nominated/appointed. So if, after Towton, there were an escheator who did not take either side at the battle, theory says he might have kept the office for a while. He might have been grateful for the income: by that time, he was paid 40 shillings per IPM.
Nell