Swarm of bees have a new brood box home but won’t go inside

Hi there
Our bees have swarmed twice in a month, and now are sitting outside their new brood box

Have you got anything inside the box to keep them there? ie frame of open brood? is there something keeping them out? ie infestation?

What’s the weather in Sydney like these past days?

When a hive swarms, it’s normal that they cast another 2 or 3 swarms.