should have know vs should have known

Some examples from the web:

• You should have let us know, lad.
• You should have let me know the plan changed.
• We should have liked to know the Commission's thinking on this.
• They should never have to know such evil.
• No parent should ever have to know the horror of burying their own child.
• You should have let us know you were coming.
• Garcia, you should have let me know before you contacted his employer.
• You should have let me know.
• I should have, I know.
• That was also a reason why I hung fire, because I should have liked to know what was right.
• My dad should have got to know you and heard your story before he judged you.
• They should have let us know they completed the swap by now.
• You should have let me know that you had your own shooter.
• You should have let me know, I woulda come to pick you up.
• You should have let us know you intended on staying this long.
• Citizens should have the right to know what their institutions are doing and why.
• I have people should know it.
• You should know I have backing from powerful forces.
• I should have issues, you know.
• You should know we have not dealt with others so graciously.

Some examples from the web:

• You should have known we were doing wrong.
• I should have known better than to reason with your kind, dhampir hunter.
• I should have known better than to indulge my curiosity.
• Yes, of course... I should have known.
• I should have known right away.
• I should have known when I saw the Ancient writing.
• You should have known I'd come along sooner or later.
• I should have known it was on the chart.
• I should have known you were incorruptible.
• She should have known, parking there.
• I should have known that stench was you.
• I should have known when they were in Macau.
• I should have known the life she was living.
• I should have known you were capable of such an outrage.
• I should have known it would be you.
• I should have known he had a knife.
• Maybe I should have known he wasn't dead.
• I should have known that that trophy was some kind of trap.
• I should have known she was the culprit.
• I should have known I'd be wrong.