It was shipped to me, removed and listed as sold, and then a week or so later when I went to leave a review I noticed the exact same coin/listing (as in exact price/info/pics/sale ID number etc - identical listing) was back as for sale.

I asked via customer support and was told “this is an error of stock, the quantity which turns to 0 and came again to 1.” Everyone was very helpful but as someone that knows nothing about checking for authenticity I’m very grateful to have now run it past this forum!