I've never bought a used sled in IL, but I've bought them in IA & WI. Both times, neither sled had a title. The current owner simply signs over the most recent registration card, which you use to get an IL registration from the IL DNR (which is super cheap). If you are concerned the sled might be stolen, you can check using the chassis VIN (sleds have a different engine VIN).
For WI or MI trail passes, you just need a D.L. & fill out a short form with name, addy, ph. #, DL#, etc.
If you have a trail pass, but no IL registration you can get written. If you ride trails, it's fairly likely. If you only ride ditches & fields the odds are pretty low that you'll even see DNR.
Not that I'm suggesting this, but most currency exchanges have the IL registration applications. A completed copy is valid for 120 days if carried on the sled. This application has no sections that are stamped or filled out by a third party