No remote and no manual?
I do know my 2802 wouldn't make a sound (even on FM) until I went through the setup procedure, which was in the manual. ..and I needed the remote, too.
Iffens I were you, the first thing I'd do is to try to dig up a manual. Many, not all, manufacturer offer them on their web site. If not, try ebay or google.
Then, depending on whatthe manual says, perhaps (perhaps?) you'll want a remote. You might want to contact Denon on this one.
It does seem a bit odd that he didn't sent the remote and manual for a unit with only 10 hours of use. Maybe that's why he didn't use it? He couldn't figure it out?