After owning my LGT for a week or so, it's stopped beeping when I press lock on the key fob. It will still honk after I mash on the lock button for a few seconds, but no beep.
Did you fix it. Directions aren't on the back of my fob - just says 'car finder function - press 'lock symbol' 3 times within 5 seconds' and a short explanation that the panic button is a panic feature! and the battery type...
but I know this... press and hold the lock and unlock buttons for a few seconds until the beep returns - repeat to disable again.
I keep mine silent, I get home very late at night. Even with the beeps disabled you'll still be warned with the beeps if the car can't be locked properly (like you've left the trunk unlatched/door ajar etc.)