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OP: you probably won't get 500 for it. First of all, it ain't that good a prime, even Nikon doesn't like it all that much (see the 1.4 primes included in their LE box -- 50 isn't in there).
I think you will but lucky get around 400. And I'm not speaking out of my ass. Refer to completed international listings like 120712169995 and 120715026968 (very dismal, that one) for auctions that are similar to yours -- very good condition, but not retail-new. Curiously, not many local Australian listings for that lens which are not retail-new buy-it-nows.
What body are you using, by the way? I find the 50mm length so much more useable since moving to full frame. I use it in lieu of a 24-70mm. If you are using DX, it's a long shot, but consider a move into FX.