a small swarm has arrived - leave them to move in, or assist?

[Penninetrader]

Very small cast arrived this morning and attached itself to the super. The hive contains one of my newly purchased mbc queens, the brood box now rammed with workers and brood in all stages. Tried to brush (with a swan's feather) the cast into a nuc - difficult with a heavyish super containing bees and nectar. I clearly missed the queen as they quickly returned to the super. Think I will just leave them to it for a while - very busy with other issues.

I have an empty nuc which has attracted about 100 bees and they seem to do random flights. They are doing no harm so I am leaving them to it whatever "it"" is