TC17
I would stronlgy assume that this is there 3 year mandatory refresher training to maintain their skills, and try to keep these long timers from becoming too complacement.

ZZ
This is what I have done for 3rd time rerefreshers that won't see like ***eggs.
Go the fun at work page on this site. Take the crazy pics of people on motorcycles 'n trucks and trains, then interpret them into forklift safety. eg the 3, or 5 people on the motorcycle is 'forklift 1 seat 1 person'. There's a pic of 2 guys with some wire/metal frame of some sort, on a scooter, holding it over their shoulders. Use that pic to discuss the dangers of oversized loads. Get my drift. I do not know how you present your material but I use PowerPoint and include these pics into the presentation.

There's tonz of pics on the net as well, and if you think outside the box, you can interpret these pics to relate to forklift safety. They'll love you for it, and you don't sound like a broken record.