So happy for you they figured it out, When I hatch chicks, I get the first two eating and drinking then the rest play follow the leader, same for getting them into the coop, when we built the new coop, took about 3 days of moving them, they figured it out. Just added 9 more, same thing, first night I had to shift them, 2nd night they all figured out where the coop was, but not the roost, 3rd night, I had to move 4 of them out of the nest boxes, 4th night I had to move 5 of them out of the nestboxes, I am going to go back to blocking them till they figure out that they are not where they are suppose to be sleeping, there is more than enough room based on the text book allotment for them, 4 sq ft in coop and 10 sq ft in run. Piling up is normal for chicks, mine are in the house, perfect temp for them and I check the tote to find the chick version of a dog pile.