Burberry outlets sell authentic trench coat made in England for $9xx retail. The one in the auction doesn't even have check lining, which basically make it look like any other generic trenchcoat in the market. There's no close-up photos of the label either which is a red flag IMO.
And for me to spend $1k on a BB trenchcoat it has to be 100% garberdine, made in England. I did buy one on ebay last year for half that price.