Yes that is true,in the past there are many of these "trustful" sellers mainly in PC Software Department.
AMAZON ist the SELLER PLATFORM (in material matter "THE SELLER FACTORY" and RESPONSIBLE for ALL 2nd & 3rd Party sellers.
If something is not ok you contact FIRST the seller.In most of the cases is this method sucessful because most of them want to stay LONGER on Amazon´s Seller List..
If NOT report to AMAZON and THEY care of that.
Amazon "bans" Seller / Amazon "hire" Sellers (not 100" correct,near ANYONE can sell on Amazon.

).
The simply explanation how Amazon works.
Thank you.
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On Amazon.de you get windows/Office Keys and Instructions from 3rd Party Sellers per Mail.