I got the iMac! I guess they weren't very familiar with macs, because everything is loose in the root of the hard drive. Also, the trash contains pictures of their baby taking a bath, which they probably wanted to delete before selling. (The seller I bought this mac from had it for three days before selling it on eBay, so it wasn't him) I don't think they knew how to empty the trash…
Anyway, I'll be doing a complete restore, so it will be like a factory-fresh iMac.
EDIT: Judging by the documents contained on the HD, this is from a senior citizen. In a document, it says "I am a senior citizen" somewhere in it. The many card games would help create this conclusion as well. Also, these documents weren't modified since 2000. Think I should keep them?