If like the guy says all bottles are full, sealed and in mint condition and he is asking (only) $ 1000,- for it I would say: "Go for it"
It's really a bargain !!
The barrelhouse will not do $ 500,-. I would say $ 250,- / $ 275,- is reasonable at the moment.
You always can make him an offer
but is no"t ripping you off.
Let me know the outcome !!