80Gb memory stick for psp

i was surfing on ebay lookin for a used psp 1.50 firmware and i found this.

an 80GB memory stick duo. i was like 80gb wow and the starting bids at 25.00$US im readin trew the page and he claim the Following:

*It says new But then he/she states Its like new

*only ten of them exist

*he/she got it in hong kong at a sony party in a raffle

*7/10 actually the 7th MS made says it in the back

*comes with a certificate that he/she lost

*and he/she is selling it due to finnacial issues

View it for your self and what you guys think about this

i havent heard sony confirming a 80gb ms the most i seen is 8 but hey technology is pretty good thease days.