The current position of the NYPD is that some random black guy wandering past a crime scene after the cops shot up a crowd decided to steal the knife that the cops considered to be key evidence. This is, to put it mildly, somewhat less credible than the claim that a crow tried to steal a murder weapon.
The police have not been a credible source of information since the BLM protests. I'm sure they lied all the time before that too but that period really put a light on how much they lie. It's their first instinct in any situation, just deny anything wrong happened and cast aspersions on the victim's character.
By "recovered" the cops unironically mean the opposite of recovered - as in a non-police person has taken the knife.
I can't tell from just this article if I should lean more to standard cop butchering of language or intentional deception.
EDIT: Or not? I found another article that says they retracted that statement about recovering the knife - that it was the wrong knife. That definitely doesn't make me less suspicious...