If you are sending a device for trade in, it's always a good idea to take pictures of the device before you send it back.
Here's a link to contact Samsung's CEO.
I think the link is still valid.
There's data in images that can prove the date of the photo.
But, yeah you should be able to trust Samsung and whichever partners they may be using to assess the condition & value of trade-ins.
I love Samsung phones. But their service is terrible, they need to hire Apple to train them how to actually run the service side of things
Personally, I'd never trade in any phone, whether it was Samsung or Apple.
Selling privately through Kijiji has always been a much better proposition. More money & no debates on the value of the phone.
I traded in my S22 Ultra with no issues, but I was definitely tempted to do private through Kijiji or Facebook Marketplace. Just seen too many videos where people **bleep** the phone and run off or drive off. Do you meet in police parking lots designated for buy and sells?