For the $300 a step-up transformer will cost you I wouldn't think twice about that being an issue.
I am not a big fan of a machine sitting unused for years though. Bad things can happen to ways and ball screws that don't get a good lubing regularly.
I might also be concerned that it is inoperable. Who knows what they may be hiding or don't even know about. If they say it needs a card, tell them you will be back when they get a card and have it running - UNLESS they are practically giving it away and potential 15G in repairs or retrofit is within your budget.
My .02
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