If a slot machine is not being advertised correctly. For example, if a reproduction machine is being sold then you can report the violation at http://pages.ebay.com/help/policies/slot-machines.html
All you need is the listing number. E-Bay does not provide a mechanism for you to explain why you are reporting the listing.
If you want to attach a note as to why you think the machine is a reproduction then go to http://cgi1.ebay.com/aw-cgi/eBayISAPI.d ... 27t+bid%29