I’m with sundog, add frames and let the bees patrol the space. If you’re adding undrawn plastic frames, the pests can’t really destroy them so they are good to add into a box in a case like this. If you are adding drawn combs, I would probably do that gradually at a rate where there will always be enough bees to patrol them. Whatever you do, never leave empty room where the bees can build their comb freehand, or you will have one big mess.