I’ve never left the keys in my outdoor equipment either but sadly the master key can be purchased at the dealer.
They tried to steal my backhoe once, thankfully my battery was dead. It would be easy for them to park a flatbed down the block, steal it and away they go.
I live in the country on a coldisack street off of a road not much traveled especially after midnight. Here in Texas with the AC on and all the windows shut not one of my neighbors would here a thing, literally.
sorry I meant hear not here
I needed to use a backhoe once. Was one conveniently parked nearby. If its a diesel, you don’t necessarily need a key. Hot-wired it and did what needed done (bury dead dog) and returned it.