It's a crap-shoot. 9 times out of 10 they'll spend more time asking you things like "people still play pinball?" and "they still make these things?", but on occasion you'll get a hard-case who will not believe that such a fancy-looking piece of HW can cost less than $10K, and contact the seller (or at least threaten to). Just be forthright and polite, and have your documentation to hand and you should be good.