Conditional Logic based on selection in Checkbox List (using Meta Box Builder)

Hello,

I am trying to set visibility of an Advanced Select Box based on the checked value in a Checkbox List and I'm doing this via the Meta Box Builder extension in WP admin.

Although the doco is very clear in terms of code to achieve this (athttps://docs.metabox.io/extensions/meta-box-conditional-logic/) I am unsure what to select in the Builder UI.

SCENARIO:

If the user checks 'Australia' in in my list of countries (checkbox_list), then the 'State - Australia' select box (select_advanced) will appear.

'State - Australia' select_advanced >> Advanced >> Conditional Logic - the settings in this section are as follow:
VISIBLE when ALL of these conditions match:
[field] [operator] [value]

FIELD: Unsure what to put... my 'checkbox_list' ID is c_country and the individual input checkboxes all have the name c_country[] in the admin edit screen source code
OPERATOR: = or in or contains ?
VALUE: Unsure whether to put "Australia" or 1/true (depends on earlier field/operator)

I have played around with a few options that I thought corresponded to the equivalent code from the docs but don't seem to be getting it right because the 'select_advanced' field is permanently visible right now.

Any guidance on the correct settings would be great. (Personally I would be comfortable coding it instead BUT I need to get familiar with the Builder interface so I can train my team.)

Thank you!