Don't bother. Hacker News is very likely to raise a cacophony about getting to see "original emails" and "screenshots" because those are dramatic, and people here like drama. You don't owe anyone more drama.
I personally could care less whether you posted screenshots or not. But if you were considering employing someone and found that they had posted something like this (with little to no evidence), what would your reaction be? Heck, what would your reaction be if it did have screenshots?
It's "could NOT care less", unless you actually care a little and in fact could care less if not for that bit of care in your heart. If that is case, accept my sincere apologies.
Pardon my pet peeve.
To answer your question: if it were me hiring a person, absence or presence of screenshots would not make any difference. A contract is a contract and the person is owed $10k.
It's called sarcasm. It's like how I say "Nice catch!" even though someone dropped the ball. Or like how someone who says "I could give a damn" probably doesn't.