Oh gosh. This is silly. Go to EBay. Search on "Toyota". See what comes up. No, TOYOTA is probably not selling anything that comes up, but they're probably all Toyota parts. And they're probably all selling for significantly less than your friendly neighborhood Toyota dealer. How is that possible? Are they all illeagal?

Search on "Toyota 4Runner Manual". All of the hard-copy factory service manuals are probably the real deal. Don't you dare pay $400 for those. If the seller took the time to copy and bind some 1000 pages, it would end up costing money.

Search on "2004 4Runner Manual" and you'll narrow it down to your model truck. As of today, I see one hard-copy that appear to be the real service manuals for $120 and one CD that says it's the electronic copy. The hard-copy appears real. I can't vouch for the CD. It may be a download of all the files. It may be from Toyota. I dunno. I'm not saying that every CD you see is real or a fake. I'm saying that you cannot make a blanket statement for certain either way without checking it out for yourself. Even if the guy there is selling a copy, you cannot say what another guy will be selling tomorrow.

[I took a look at they CD guy's feedback. It appears as though that particular CD might be a copy based on the feedback of others. Although he does get a pretty high feedback rating (above 98%), maybe no one really cares if they're getting a copy. Being that he's been around for a while and has sold a few thousand copies, it's curious he has lasted this long. Maybe EBay doesn't care as long as they get their cut?]

At any rate, the hard-copy manuals are real and easier to use. Grab one of those.