Unfulfillable inventory due to damaged items

Hi Guys,

New to FBA and recently sent my first shipment to FBA but received a mail saying that inventory is unfulfillable due to damaged items. I had attached the SKU labels on each item but there was no MRP label. I also forgot to put the delivery challan inside the box. Could this be a reason of unfulfillable inventory? Because our packaging is solid and there is no way the products are actually damaged. Please help out.