Lost phone

If your phone is lost at home with it switched off or it is stolen with the ROM and/or IMEI number changed, it is very impossible to track its location now, whether it is through your network operator or even Google Locate.

The only way is to contact Razer Support to pay for a replacement since the limited warranty for Razer phones don't cover loss or theft of the phone.

If the Android device manager can't locate it's position and you've no third party tracking software then you're out of luck unfortunately. Best to ban the IMEI and cut your losses really.