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…
Burning down Twitter has definitely been useful.