Generally speaking, one should not mark an unidentified observation as captive/cultivated, because that changes it from “Needs ID” to “Casual”, where it is much less likely to be identified. This is due to (what can be viewed as) a flaw in the design of the site. After an observation has reached “Research Grade” is the time to debate whether it counts as wild or not.
One exception is cultivars which are basically non-existent in the wild. Often these are ornamental plants. These are essentially unidentifiable to naturalists (though a florist could certainly do it), so removing it from “Needs ID” makes identification more efficient for naturalists. I suspect handling cases like this is one of the original reasons the wild/not-wild distinction was added to the DQA section.
In this specific case, the observation is at or near the moment when the baby turtles transition from captive to wild (possibly introduced), so you could go either way. It should also be noted that the eggs were probably laid by a wild turtle, and only temporarily “captured” for safekeeping. If it’s known that they’re being released on the same beach where they were captured, I would be inclined to leave the observations as wild, since it documents a location where real wild activity happened. If not, then it’s still a grey area, since you won’t be able to know for a while whether the turtles will return to lay eggs on that beach. But again, if you’re going to mark it captive, wait until the community can identify the turtles.
By the strict definition, planted trees are considered cultivated, in the same way that crop plants in a field or trees in an orchard are. However, if it looks like they could be identified, you shouldn’t remove them from the “Needs ID” list right away. In the past I have been overzealous in marking unidentified trees in cities and city parks as captive/cultivated, when they could easily have been identified by local naturalists. I regret this now. So, try to learn from my mistake, and be cautious about marking (unidentified) things as non-wild.