In general, goods you sent > Goods received in the FBA warehouse > Goods finally show up in your inventory. It can be due to mistakes by the warehouse guy during check-in or damaged on the way (distributor damaged). If you don’t ask for reimbursement, Amazon often “forgets” to reimburse you. You will lose a lot of money in this process and you have ONLY 9 months to claim the loss! The goods counted into the FBA inventory may be way less than the goods you send. FBA check-in step makes mistakes and can cause huge loss to your business. You have only 9 months to claim your loss!