Liberator IX serial number question.

[Alex Smart]

Hello,
I am a little puzzled over the serial numbers of the Liberator IX's.
From the Air Britain RAF Aircraft serial numbers books KA100 - KZ999 and JA100 - JZ999
Matched with the USN Bu Nos via the Joe Baugher .com USN serial number site
We have the following -
27 a/c
90021 - JT973 through to 90047 - JT999.
Then
64 a/c
90048 - JV936 through to 90111 - JV999.
But only JV936 as JV937 to JV999 (63 a/c) were not delivered.
What became of those 63 a/c that were not delivered ?

Then we have
168 a/c
KE118 to KE285 not delivered.

However for this last batch of Liberator IX's
if we look at the Air Britain book "The British Air Commission & Lend-Lease" on page 125 we have for the KE serial batch only the following -
KE266 - KE285 (29) 90112 -90131 (20) Cancelled.
So firstly KE266 to KE285 is only 20 a/c so is the number (29) a printers error ?
Then were did those a/c numbered KE118 to KE265 go ?
Finaly what became of those KE266 to KE284 ?
Thanks
Alex