I can't get the Leash Ring from the Key Box

If you get an error that the “Leash Ring” is not found, it probably means there's an SL asset server error.

1. Get a fresh Key Box from your sub (say /1. and HUD Menu > take keys), or if is still bugged,

2. Ask your sub to get a fresh HUD (HUD Menu > HELP… > New HUD…), activate and then get a fresh Key Box (see 1. above).

If you are given keys but not the Leash Ring, it means that your Key Box is an earlier version that doesn't have it.

Get your sub to update her Collar.

Then take keys again.