You can't find this,
Some walkie-talkies, relay stations and remote control killing functions can remotely kill lost walkie-talkies, so that your current frequency of use will not be maliciously disturbed.
Unlike mobile phones or GPS, walkie-talkies can locate.
And you don't know who has the walkie-talkie, and you can't locate the position of the walkie-talkie by direction finding.
I hope it helps you.