Thanks for the directions, checking the technicals page BKA to BKF were printed to it's fullest extent p289. On p294, they only mention serial numbers of the last four sheets of both printers along with the total sheets printed and delivered 114516 sheets. But no breakdown of the actual ranges per sheets per prefix. I guess without that information I should be better passing off this buying opportunity. With so little time left it appeared that so did everyone else. I think the note passed unbidded. Whew....