Since you probably know what the title keys site is, go there and sort by the ticket column, descending. That shows items with valid tickets first - those are the disc games. Then look for the ones where the Title Key is blank. Those are the disc-only games.
The key is actually in the ticket, but since the site can't find a matching NUS title, it doesn't display the key.
As of a couple days ago, the site has tickets for all EUR and US disc games (we think) so that's a pretty good source. You can also look at
The WiiU Title Database for games that say "No TMD". I don't know if that page is fully up to date though.