I found one of Obama's books on Amazon long before the first Trump campaign, and it had "Barack Obama was born in Kenya" as first sentence of the dust cover blurb. (Dust cover blurbs are written by the author's themselves, perhaps edited or guided by marketing-oriented proof-readers.) That does not mean that Obama was indeed born in Kenya, he might have lied to make himself interesting or exotic or whatever. The book is not there anymore, but I know what I've seen.

The PDF of the birth certificate released on the whitehouse.gov website was an incredible mess of layers (as in photoshop) with courier font characters from the image processing program mixed with the typewritten pixels from the scan. I was in a jolly forum discussing and chuckling about the mess, it was incredible. I didn't have a PDF browser for multiple layers, but the manipulation was obvious when zooming into certain spots and looking at the pixels. It was quite mysterious what had been faked, it was not only the place of birth.

Then there is the old classified ad in the "Honolulu Sentinel" (or something like that) announcing Barack Obama's birth in early August 1961. I saw that the first time around the time of Obama's first election in rather low quality (multigenerational Xerox or something) and thought that it would be hard to fake that retroactively for a bunch of vintage newspapers (which can be carbon-dated if push comes to shove). However, the scan was not from a newspaper copy but from microfiche in some archive, and microfiche can easily be faked although I wouldn't leave the job to the idiots who botched the whitehouse birth certificate. There was a thread on campidiot or something where people posted pictures of the "Honolulu Sentinel" microfiche collection and the 1961 roll was obviously a different brand than the others and more recent. Those were people who went to their local libraries and took the pictures.

I tried to find all this again shortly after Trump was elected for the first time but couldn't. I wasn't into archiving anything or even paying much attention at the time when the stuff was still on the internet, but perhaps anons on 4chan remember. (I became a 4chan regular in 2016; the aforementioned info tidbits are from years earlier when I wasn't a regular anywhere.)