Hi Mike
Now you have sent the better pictures, I have to agree with Roy and Kev that the cane looks unlike a Whitefriars monk. You mentioned that it was black although in the new pictures it looks definitely blue to me so as Kev says it could be a cane pushed through and distorted . However, it seems odd that all the other canes were even enough not to push through. Good luck with your investigation
Best regards
Derek