Depending on another variable value, remove / add options in list collector

[JuliaHowells]

On a catalog item, I have two variables:

Location

Accessories

If the Location is TEST, then I need to hide two of the accessory options from the list collector view. Below I have an OnChange Client Script, but it does not appear to be removing or adding options. They all show in all scenarios. 

function onChange(control, oldValue, newValue, isLoading) {
    if (isLoading || newValue == '') {
        return;
    }
    // if location is FLC, remove wireless keyboard and wireless mouse from options
    if (g_form.getValue('location') == 'cee089228779c91009d831583cbb35ba') { // TEST Sys ID
        //these items are in a list collector
        g_form.removeOption('special_accessories', 'Wireless keyboard' ,'Wireless keyboard');
        g_form.removeOption('special_accessories', 'Wireless mouse', 'Wireless mouse');
        g_form.addOption('special_accessories', 'Headset', 'Headset');
        g_form.addOption('special_accessories', 'Second monitor','Second monitor');
    } else {
        g_form.addOption('special_accessories', 'Wireless keyboard' , 'Wireless keyboard');
        g_form.addOption('special_accessories', 'Wireless mouse', 'Wireless mouse');
        g_form.addOption('special_accessories', 'Headset', 'Headset');
        g_form.addOption('special_accessories', 'Second monitor', 'Second monitor');
	}
}

 Any ideas?

[AshishKM]

how are you adding those values on form load.

and  what is the result of the below line of code, add alert method for run time value check

g_form.getValue('location')