August long and boxing days are not real stats in Manitoba. They are optional paid days here for employers.

In my contract it lists all stat/paid days that I close. It includes the August long civic holiday as well as Boxing Day. Make sure you word it in your contract as a paid closed day (not just a stat day) then they can't complain. You are allowed to close whatever days you want as long as you follow the rules that you set out in your own contract.