Macbook White Unibody Liquid Damage Indicators

I just purchased a Macbook which I suspect may have been subject to liquid damage. I've taken most of it apart and there is no corrosion although the back panel has some oxidation (orangish color). Is this from liquid damage or could it be from heat?

Can someone please pinpoint where the liquid damage indicators are in the unibody Macbook? I've searched all to no availability.

Thanks for the response! Are the little white dots these little things?

I noticed that in the second picture, mine are black whereas on ifixit, they are white. Is this something that I should be worried about?

Hey Detrius, thanks so much for the responses.

The black dots are definitely not stickers. I tried peeling them off but there is no adhesive so I think that the black dots were there when the computer was manufactured. They almost feel granite like.

Anyways, I took it into the Apple store where they checked everything out, noted that there was no water damage, and sent it to their facilities to get everything fixed. They put it in as a "Tier 4" which means that everything will be replaced. This is awesome considering I purchased the computer for $150... It's still $999 on Apple's website!

I can't say enough about Apple's service!