It is most likely something like supermicro SYS-6016GT
But that is the 1400w model and he says his is 1000w model which i'v never seen but who know's as I am not sure what his is.
If he is legit he probably can't post pics because I assume they are running in a server rack.
But all in all, before asking for 1000's of dollars for a item most are not familiar with, it is probably best to have pictures and exact model numbers ready.