I suggest going to HarperCollins and finding your PIDs there. Copy one to the "clipboard "and paste it into the command line (however this is done under OS X). So far as I know the PID is always 10 characters long and the last two characters are the checksum (confirming that the 1st 8 are correct). If this works, most likely you have misread a 1 as I or a zero 0 as a O.
MobiPocket does not say how long a PID is (even though it is obvious by inspection), but it does say:
incorrect PID message on web site:
Quote:
Problem
You get the "Incorrect PID" message when trying to ente ryour PID on the web site.
Cause
The PID you are entering is incorrect, because some of the characters are confusing.
Solution
Double check every character that can be confusing: 0 (zero) and O, 1 and I etc.
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Here "Incorrect PID" is exactly the same as "Error: invalid PID checksum" (since that is what the checksum is for).
If none of this works, Igor kindly provided us with the PID of someones Kindle to test kindlefix.py. So try V176CXM*FZ as the PID. It will fail because this isn't a PID authorized for your ebook, but the point is this PID has a valid checksum and so it should fail with a different error message (Error: no key found. maybe the PID is incorrect).