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I seriously doubt the ATX outfit including the detector is fake for many reasons.
The cost of the tooling to make a fake ATX with the relatively low sales volume would be insane.
The seller has been a eBay member for four years and has 100% positive feedback.
Not only that, but whoever purchases it and is not satisfied for ANY reason, all they have to do is file a dispute and eBay will force the seller to refund the purchase price.
The eBay Buyer Protection Plan with a Money Back Guarantee really screws the seller by freezing the money in their PayPay account until the dispute is settled. I have been there with a scammer buyer that I sold something too. The buyer said that the item didn't work and I sold it As-Is/No returns, it did work when I shipped it, and eBay still made me return the purchase price and pay to have it shipped back. The seller get screwed every time by eBay!!
And the $1700 selling price is inline for a used ATX.