Only if they are in the dispute console. Ebay won't take the time otherwise. They often never actually 'look' at a dispute, because it's an automated process.
A seller has to prove an item arrived with online tracking for Item Not Received.
A seller has to accept an item for return if it's Not as Described, unless the item specifics chosen were 'for parts or repair.'
Ebay WILL step in sometimes over shipping large items back that cost a lot to ship.
What is your situation?