It just mean you can return the item you receive within 7 day of item received if found unsatisfied, damage, broken.
However, it doesn't guarantee it is a genuine product.

link?
almost every product have this

best way to see it is from the warranty.
local manufacture: genuine

Still not guarantee if it is genuine.
Genuine or not genuine need to compare to real genuine product only will know.

You do still get 1 year supplier warranty from Ring Mobile, not from Spigen.
It may still genuine, but warranty not from Spigen.

local supplier for mobile normally AP.
in this case, i am not sure.