The bike is missing some key bits (muffler, plastics, although he say he has them)
It has a headlight which would indicate its done a lot of km's, and the KX's dont like that.
The expansion chamber looks like it it's shot
The overall condition of the bike is rather tatty
AND..... He wants $3000 for it will so it will be a very expensive project.
$1500 - $2000 and it would be worth looking at, not $3000