Hi,
For past years I had work in Security Printer Company. In relation to your question regarding the Magnetic Ink Character Recognition (MICR) as far as I know there is a machine provided with to read such MICR line that is used by Security Printer Company e.g. Central Bank and the Banks. The check number has checking digits computations which have a combination of the bank branch number, and it is depending on the bank for the computation of the checking digits to arrive such check number for their check security. I think the best way you to do is to contact such Security Printer Company or the Central Bank and the Bank to coordinate such query.
Hope this could help.
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Regards,
Algem