In the rehabber thread that @upupa-epops linked above, I said
In the context of rehabbing, it was pretty clear the animal would only be captive for a relatively short period of time. In the context of this thread, where animals may be kept in perpetuity, I feel like I should add a bit:
I think people are fine with marking something as wild even when captive so long as the observation has the wild location and the wild date, and the individual hasn’t changed significantly in appearance since the wild date.
Captivity can impact many aspects of appearance, e.g. body mass, timing of molt, brightness of color, etc. In my opinion, if a photo is marked wild, it should have the wild date, the wild location, and the wild appearance.