[78-L] Canadian Apex 4000 series with OKeh recordings

[Han Enderman]

The Canadian Apex 4000 series contains issues from the OKeh 4000 
series, with the same cat.nr as the OK release.
The numerical series is not complete, I assume, since BGR-4 does not
mention Apex issues for the OK Mamie Smith recordings.
I have label images of 9 issues in the range 4252 (Samuels, rec Jan 1921) 
- 4564 (Markel, rec Feb 1922), so this is a rare series.

QUESTION: what is the range of the Apex 4000 series, issued 1921-1922 ?
Which issues are actually known ? 
These are not in ADBD, and I do not know if ADBORAF lists them.

Barr reported that Apex 4000-4024 are not the same as the OKehs 
with these numbers.
Apex 4002 is on ebay and has Shannon Four from OK 4747-4748, 
rec Oct 1922 and pres. released 1923.
This indicates that Apex 4000-4024 were issued after Apex 4564.
Is there a list of this small series? Or info on some issues?

han enderman