SeatedNut said exactly what it is, preying on the uninformed. If you look around on
ebay there are a ton of people just like this, if not worse, hoping that some new collector will jump at the chance and pay an arm and a leg for scrap. At least when I did it I did not lose anything and the coins were worth what I paid but not what was quoted.
If it is not from one of the big companies, then do NOT trust it and I would not buy it. When it comes to gold and older pieces there are a lot of fakes, cleaned and switched items. This guys site contradicts itself in the way he lists if you read all the text, if you only have a handful of coins to offer then there should be no mistakes at all.