Q: Key Chain migration problem

Unfortunately  migration assistant can't help me, I have formatted my old mac  and gave it to new owner. But just in case I have copied to my keychain folder to my usb. Is there any way to add them to my new mac?

Keychain Access: Copy keychains to another Mac

I have followed the instructions above.

No it is not. I had more than 100 items on local items chain and around 50 items on system chain. when I add previous keychain to my new mac, local items and system is still empty but login keychain is same as old one.

I have not used iCloud before and just in case I save all keychain file. It has only login.keychain and keychain-2.db, keychain-2.db-shm, keychain-2.db-wal and user.kb. The important keychain for me is local items one.

I see, thank you for your help.