Enterprises in export processing zones are also equivalent to overseas enterprises. Since the export has been reported, your actual foreign exchange receipt will be less than the customs declaration (within $500), so it is no problem to go to the foreign exchange bureau for verification, because the foreign exchange bureau allows the difference of plus or minus $500, but it cannot be written off beyond this limit, so I suggest you do this: if the customer has a follow-up order with you, you can make a price difference in the subsequent customs declaration unit price or even the account, because foreign exchange verification can be written off in batches. If the follow-up order is not big enough to absorb the amount you overcharged, it is better to go to the customs to delete the order. If it is the agent of the customs broker, they can operate.