You need a tracker attached to your fob...
https://support.thetrackr.com/hc/en-us/articles/207883113-Separation-Alerts
https://support.thetrackr.com/hc/en-us/articles/207883113-Separation-Alerts
That's the idea...if you've lost them once...you can do it again...too late for that now, maybe the next one.