You cannot trust samsung with trade-ins. do an online search and you will find all kinds of horror stories.
I bought a new S10 from Samsung online and traded in my old S9 plus. I followed the instructions and sent in my old S9 plus. Later, Samsung emailed me and said my traded-in phone did not qualify for the full $550 trade-in value. Samsung's email includes links to photos showing what supposed to be my phone. NO, the photos show an old S7 that is NOT my phone. Some one at Samsung either messed up my traded-in or worse stole my trade-in phone.
I called Samsung and make my case. Over a week past, no solution yet. They asked me for a picture of my trade-in phone. What's the point? I could take a picture and put in a different phone in the box. Samsung should have the burden to prove what I sent in. NO TRUST! Horrible!