There's nothing too helpful in this ad that would lead me to conclude this was an original Z/28, but the trim tag seems to be in place (despite the seller not mentioning it). CE block, so no luck there. And, bidding begins at $20k which seems nuts unless you can justify the Z/28 pedigree. Still, these cars are occasionally worth checking out - there's an old set of tow tabs in one of the pics, and who knows, this might be an original black RS/Z for all I know...and the seller may be more negotiable on the price after a conversation.
Link to 1969 Camaro auction
124379N687432