Myself I just received an envelope to exchange the phone. The thing is I bought two phones within an hours difference and so far only one return package. I guess I have to wait for another one.
But I did get myself into weird situation where I don't know for which phone this return package is. I'm trading two phones and they're both the same Huawei model, when I was placing an order for S21 I did entered requested IMEI number accordingly. But return label does not reference IMEI number or order number. Maybe it doesn't matter but I don't want them to open first package and tell me that I sent wrong phone.