How do I check the seal on a PS2?

[wubb]

Where is the seal on a slim model PS2?

I might be buying one from a guy and I'm just wondering what the seal looks like. I figure it will probably be obvious, but I don't want to get suckered if he completely removed it and replaced it with something that looks 'pretty much right'. Or if it's completely gone, I'd like to at least semi-know what I'm talking about if he gives me a blank stare when I ask about the seal.

 

[Apossum]

It's a sticker on the back that says "Breaking this seal voids your warranty" or something to that effect.

 

[The VGM]

If it's a fat one, there is a black sticker on the back.

The one he is peeling off. If the sticker is cut or says void all over it, you know it has been tampered with. I heard you can take a blowdryer to it and get it off without making it look like you did though....