For a normal hive, yes, it is way to early. The time this hive has been there is unknown. It could be a very new swarm. The number of bees exiting the first 3 days was very high. Too high for a normal trap out. I think, tho not sure, that the queen has left the house. Whether she is in the box or not is unknown.
I would remove the cone and watch for pollen going in. Hopefully, the box bees will rob the house out and remove any bees that may still be there. If not, the cone can be replaced.
Remember, the trap out method is still new and experimental. Each one teaches us a little more. As said above, thanks for the thread. It is enlightening to all of us.