Where do I get Keys for the Lockbox Event?

Keys are available to win as a prize in various themed Collection Events.
Keys are offered in certain Stage Events and/or some High Rollers stages in the High Stakes path. To confirm if a Stage offers Lockbox Keys, look for the Key icon that correlates with the current themed Lockbox Event from the "Win Up To" screen of each of the Bingo Stages.
Some Bundles in the Store include Lockbox Keys as a Bonus.

Below is an example using the "Soapbox Cars" themed Lockbox Event. Each Lockbox Event has its own unique Key design to match the theme.

Please note, the availability of Keys around the game can change and vary between players.