○○様
請求書のコピーを添付します。
請求書の商品のうち、各48個ずつはすでに日本に転送済みです。
よろしくお願いします。
Dear ○○
We attached a copy of an invoice.
Among the items that are listed in the invoice, 48 pieces have already been
forwarded to Japan respectively.
We appreciate your understanding.