Confusion on shipping back trade in phones

My wife and I have just traded in our I-Phones for the new I-Phone 13Pro. So yesterday 2 boxes arrived for us to send the phones back. However my wife and I had diffent models (one is I-Phone 11 and the other is I-Phone 11 Pro) to send back. The 2 boxes sent do not indicate which phone goes into which box. I am very concerned that we wil get less trade in value if the correct phone is not placed in the correct return box. My wife is on a trip overseaes. I asked her if the email confirmation Apple sent to us had any reference numbers of any kind that might indicate this. But she said it wa a very generric emial without such numbers. Who at Apple can hlep me? This is time sensitive !!!