s Koike san sent you the attached photo,
we can not find envelope on the box.
Now we requested carrier if there are any lost at airport warehouse and on the plane or not.
Because the way you stick on the box was not enough strong, then envelope dropped from the box during the transportation.
If we can not find this lost envelope at Narita, we have to dispose this cargo.
In addition,
if we can not find envelope, we must pay for disposal fee and air shipment cost for this shipment.
Please kindly note that if you stick the envelope on the top of Box, please double check it’s enough or not.