Dear {Name},
Thank you for the opportunity to {test/purchase} the {item} via {insurance company/union membership/etc.}. Unfortunately, it will not work out for us after all.
I saw that the device had shipped and I read more carefully the FAQ included in the shipping confirmation email. I now see that the {item} is not compatible with our situation and no longer wish to proceed.
I'm sorry for any inconvenience and will mail the {item} back immediately upon arrival, unopened. Can you please provide a mailing address for this?
Sincerely,
{Sender}
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