Wayyyy too many variables to give you a solid answer. It'll even depend on your location and local market as to who will be willing to buy and what the economics are of purchasing in your local market.
Using my 2004 VF-2 as a point of reference: there is an almost identical machine to mine on eBay that has similar in-cut hours to the mini you mentioned (and three years newer). It's listed for about half of the new purchase price and it's been relisted a couple of times with no takers.
Based on that, I'd say that Mini is probably worth somewhere south of half of its new price (not the current 'new' price). That might still be high, depending on condition but it's a starting point.
Are you buying or selling?