New systems were often sold as packages with a certain number of blue cards included. To prevent unscrupulous "third market" vendors from scrounging systems and breaking up package deals, the blue cards were limited by a "purchased option" in form 4.

For example, a line in form 4 may say "Max. BNIC: 4" or "MAX BONS: 2" and this indicates the package sold with the system. It can only be changed by buying new licenses from Mitel.

Since the White ONS/DNIC cards are not limited in this way, you can add white cards above the number of blue listed, but you cannot add additional blue cards. You are limited to the total port count licenses shown in form 4, but a one-for-one swap of a white ONS in place of a blue ONS will retain the same net port count.

A technicality: MiTeL tends to get snippy when they discover that a system has been scrounged and re-sold. Technically, the licensing applies ONLY to the ORIGINAL purchaser, and are NOT transferable. Your buddy "trying to get a good price on the pulled system" is technically violating the agreement between Mitel and the Original Purchaser. FWIW.