Can you elaborate on what you mean by this? I'm not sure I understand.
When you look to the item for sale to the buy section of the website , it could be great if we can have a filter to directly see the New item that be add ,dont matter the game .
That is possible already. You click the '"new sealed" button on any marketplace search result and then click "filter". That will show you a list of games that are new condition only.
Here is an example of the end result.
Customer support service by UserEcho