Sir,
Sub-rule (6) of Rule 11 of Central Excise Rules, 2002 stipulates that "before making use if the Invoice book, the serial numbers of the same shall be intimated to the Superintendent of Central Excise having jurisdiction. Rule 27 of the same rules stipulates that "a breach of these rules shall, where no other penalty is provided herein or in the Act, be punishable with a penalty which may extend to five thousand rupees and with confiscation of the goods in respect of which the offence is committed." In my opinion non-intimation of serial numbers of invoices cannot be treated as offence. But you can even now indicate the invoice numbers with a request that the belated intimation may be condoned.