No real major issues here. That image looks like the card has snagged on something and been forcefully removed. May be worth inspecting the contacts and surrounding area inside the DS Slot 1. I have found with different DS's, the DSTT may require a very slight wiggle from side to side to eject completely. Also, the spring loaded Micro SD slot can also require a wiggle, but I can cope with that
If the DSTT is faulty, just return it for a replacement. I wouldn't butcher it out of curiosity.