hi there me again
still saying i feel so bad for you.
but, I want to add. Just because my own gut reaction to such a situation would have been 95% not take the vet's advice -- YOU were still Right to take their advice. For me, I can confidently say "2nd Opinion Required," knowing I'm within reach of several good veterinary choices. Most people don't necessarily have multiple avian vets to easily choose from.
So although if it were me with my bird, my own immediate gut response would be, "just give me back my bird!" -- that does NOT mean they were wrong.
It is certainly Quite Possible that your bird might have had a severe skull fracture, perhaps fractured badly enough to be obvious to a veterinarian's examination with truly no need for an x-ray. Certainly Possible that such a severe fracture may have clearly been there, potentially causing great pain which a bird might hide, possibly inoperable and untreatable.
And given such a scenario then potentially the only option they gave you, may have indeed been the best choice.
AS noted frequently on this website, birds can and do hide illness and injury quite well. There are indeed times when a bird seems perfectly fine right up until it suddenly dies. So even though the bird Seemed almost fine, it does not mean absolutely that he really Was fine.
It is certainly Possible the veterinarian may have been 100% correct. The only way to know for certain would be to get a necroscopy done, as Parrotgenie suggests.
(ps I am still upset that you were pressured to choose so quickly. And again, I am so very sorry and sad for your loss.)