Dear Corrado,
Actually production batch number will be put on the label sticker for all boxes. Please find attached the sample of label sticker for your reference.
Could you please inform Novacel to report batch number of defective blanks?
We will track batch number and we will check lenses which were produced at the same time as your order.
If you have any concerns please feel free to contact us.
Best Regards,
Nun
Best Regards,
Nuntika