Have you cleared the airport custom?
Keris is included in dangerous good, so it can't be carried to cabin, and depends on the airlines, you must declared it as dangerous good and fill the dangerous good form from the security, then in the destination you can pick it up at the security booth.
But most of the time you just need to declare it when xrayed.
Also keris can be put into cultural heritage item, so to proof that it isn't you need to keep the invoice of the item.
In the worst way you need to go to government office that handle artifact and have them examine the good and gives letter that it is not an artifact/ cultural heritage goods.
Sent from my BV8000Pro using Tapatalk