Sorry for the late reply.
Issue is resolved now.
An Unsupported/incorrect SFP was inserted into one of the interface ( Eth1-02). I found the error message ( as Unsupported ) when I executed dmesg command ( weird thing it was referring to Eth1-01 interface MAC address and saying unsupported SFP was inserted into it).
Once a supported version ( Finisar) SFP was inserted into it and the gateway was rebooted all 10G interfaces were visible.
But I'm still unable to find the Line card Model type.
I executed 'show asset all' it only shows the line card type but not the model. Is there any way I can find the Line Card Model type other than by 'show asset all' ?
FYI: These SG 5600 Boxes are not bran new. We are using a used Inventory from our Data Center and I had to Factory reset them using the "Reset' button on the Front Panel.