Hi Stefan,
I am with the others.
No.1.: ethnograhic knife from the mentioned regions, when from Thailand called enep.
No.2.: Burmese, dha knife, could be also from the 40's, made for use or for selling but very traditional, I have a similar worked sword
No.3.: When I am not completely wrong it's Indonesian, army (baton with hidden dagger)
No.4.: Yes, Chinese fake