Even if the cells are legit, seller is a joke.
1) legit cell would present marks
2) they mix Sanyo, Sony and Panasonic all together. At least 1 brand to much.
Says on this PDF http://nkon.nl/sk/k/NCR18650BL-specification.pdf
That discharge current should not exceed 7A/cell.
It could be similar to the Sanyo NCR18650BF as it has a similar max discharge rating. http://www.dampfakkus.de/akkutest.php?id=552
http://www.dampfakkus.de/akkuvergleich.php?akku1=507&akku2=552&akku3=490&akku4=353&akku5=523&akku6=258
It could have similar properties as the Samsung 29E where it has a high capacity if the draw is low but will sag and loose its promised capacity at higher draw. (try flicking between 2A and 5A draw on the chart and see the difference in behavior)