It wasn't a reseller that I recognise (like ebuyer or PC World) and they had no reviews as a seller on the marketplace, though that doesn't necessarily mean it's a scam.
Well, in this case it was too good to be true,
The seller left Amazon as soon as the purchase was made though Amazon are already on the case
Seems your reaching out to check if they were legit was well founded! But now I've learned that even on Amazon scams are about (learn something new everyday right?)