Well I guess that really depends on you.Do you want to know yourself that without any work to be done you can take it off display and run it?
Or are you just happy to know it was as it was when it was new?
Most of my display mowers run,but I do that so at least it keeps them with fresh oil in them.
I have a model 5 coffee table and I know that if I put a cutting disc on it it would run again.
So what I'm saying is,it really is up to you and what your happy with.After all it's your display.
I know that doesn't answer your question but in some way I hope that helps.