Well, it was the only example I could think of at that moment
Apart from the writing quality, personally, I found the presentation of the file, the cover image and the posting of it on a site like this big giveaways.
Just for fun, here's a couple of links to real sagas (not that they might not be fiction - we can't be certain) - they're considered some of the best.
Egil Skallagrimsson's Saga
Njal's Saga