Creating a new giveaway, but not sure if key still works

Just save it and cleverly drop it (in a thread) when you feel like handing it out I guess. I think there's ways to test if it's still "on" but I don't know how, ask around.

Make a private or group giveaway for people who will give consent to delete the giveaway if the key doesn't work (very difficult), or avoid the risk and not make the giveaway.

SORRY I BROKE THE RULES, EVEN THOUGH IT WAS A JOKE. I want to keep this comment because wykydvamp said I have begged before, even though I haven't (even jokingly). So yeah... I don't want to be labelled as a beggar because some random guy wants to support his argument.

So starting a public giveaway is a big no-no. Thx

if you got a friend who already owns the game you can ask him to test it

You can either make a key drop or a forum giveaway. No consequences if the key turns out to be already in use.

You could also make a regular giveaway, but if the key turns out to be a dud, you have to either take the non-delivered on your profile or be ready to provide a working copy of the game to the winner.

Latch it onto another giveaway. An unofficial bonus two-fer.