Thanks all, I actually sold it on Craigslist, b"H not a scammer, and got what I wanted for it ($325).
Thanks for the advice and offers anyways!
And no, those vouchers are for use on the airline they were issued, from so no transferring (as far as I know).
So, if case anyone wants to sell a voucher Craigslist is probably your best bet (I got about 5 responses in 12 hours- not too bad!)
I wonder why this forum doesn't allow the sale of vouchers- is it for legal reasons? just curious to know why not.