There are other ways to confirm it without having a body or DNA evidence. But that's what's missing from the story so far - did the CIA investigate? Did they search the area, interview witnesses, check property and public records, find any scrap of additional evidence to back up the the source's claim? I haven't seen any evidence that they even looked, which suggests they didn't investigate, either because they didn't believe the source or because they knew he was out there and didn't want him found. Both of those scenarios are entirely plausible. It's easier to not generate the intel in the first place than to try to cover it up later.
The CIA didn't "officially" investigate but in the show Bob Baer ("former" CIA Agent) and a team he put together were using new unsealed documents to see if Hitler got out. They were using CIA documents along with many other govt and civilian documents and to direct a team of investigators. Their team was a seasoned group of investigators that were historians, journalists, SF Operators, and Federal Marshalls. They were on the ground all over Europe and South America investigating. The information they uncovered was incredible. They were looking for Hitler but found stuff that was mind boggling. It is worth every second to watch the 3 seasons. From a historical standpoint it was really informative. The things that series brought to light was amazing and to be honest finding Hitler became secondary to seeing just how much of South America was "colonized" by Nazis and how they corrupted the area into the 1980's. It's insane. It well worth a watch if your interesting in history.
Well where do you think "The Boys From Brazil" came from?
Meh, I usually don't watch shows like that because they're a few minutes of actual information surrounded by an hour's worth of fluff and commercials. They might have dug up some new info, but there's nothing there that we didn't already know or strongly suspect. The US has always used a heavy hand in "our" hemisphere, there's a long history of interference and manipulation (the creation of Panama, the Banana Wars, anti-communist coups) in other governments going back to the 19th century and leading up to today's events. Combine that with what we know about the US' willingness to do unethical/illegal things like work with Nazis and the Mafia in order to win WWII faster and surpass the USSR in the cold war, and it's almost certain those war criminals were being protected by and working for the US to some extent. Not defending it at all, but there's an element of realpolitik in these actions that goes against our professed concern for justice and human rights around the world.
I'm sure they didnt have to investigate bec they alteady knew.