Hello Mamata Chakravartti
Thank you for joining the community!
The serial numbers occasionally can have different number on the boxes compared to products as the AM300 is also packaged with the Lifestyle 600/650 systems. The serial number on the actual product/component is the most reliable serial number to utilize. If you have any further concerns, I would recommend contacting your local support center to have them validate the numbers for you. Just click HERE and select your country and Contact Us at the bottom.
Tony A - Community Support