Where to Store Backup Keys for My Chastity Cage?

“I’m seeing a lovely woman who participates in the BDSM lifestyle, and I’ve found what seems like a comfortable chastity cage for long-term wear (A-278). So, I told her about my wish to be locked up. Since we live apart, she suggested keeping an emergency key somewhere at my place just in case we go ahead with it.

What should I use? Will this work? … r=8-7&th=1 … =8-11&th=1

She can give me the combination if I need it, and likely change it later on.”