Not finding 'password', 'foobar', '1234' suggests salted passwords.

'password' and 'foobar' are both in there. '1234' is not, but that's probably because of a minimum length requirement.

Edit: '12345678' is in there, further bolstering the length requirement theory.

Correct.

From LinkedIn: "Passwords are case-sensitive and must be at least 6 characters."

Very good point. Although some sites have password rules that would prevent those.

The hash list posted might be incomplete.

check jgrahamc post at the top