As I recall, the NYC cops had the laptop and I don’t remember it ever leaving their posession.
I seem to recall that the fibbies forcefully took possession of the material held by the NY cops.
As I recall it, the NYC cops indeed found the emails and then notified the FBI. McCabe sat on the knowledge of the emails’ existence for three weeks and then Comey found out. He decided they could not be found after the election to have ignored this entirely, so he ran a phony one-week investigation to declare that they had reviewed 600,000 emails and found nothing new.