I think you're right on track , with the idea to contact Otis , pantrwrstl !
I've known folks from the Otis company & have had several 'rides' on high-speed/testing elevators at the company 'test site' for elevators in Moline , Illinios .
I've experienced great relations with various folks from the company & I'd suggest only requesting/asking questions concerning the history of your item, (IMO) .