Thanks for the detailed explanation, that’s really helpful.

Just trying to understand this practically:

If the item is returned clearly used (for example adhesive mounts
applied/removed, protective films taken off, visible installation marks, or
missing consumables like stickers), how do sellers usually handle this?

Even as a private seller, is there any accepted way to reflect the reduced
resale value, or is it always expected to issue a full refund regardless of
condition?

I’m trying to understand what actually happens in real cases versus just
theory.

Thanks again for your help.