I would honestly not.
Noone ever gets rid of a quality PSU. People ride em out till they die (if they do).
Seems like from the other items he sold the guy was parting out his system.
oh well just bought it, seems like quality stuff and doubt it was made to last 2years and for the past 5years I havent had a single PC part die just because of the age.
90% chance it will be ok,just hope it wont be the 10% this time