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don't.if you are not sure,don't take the risk

If you didn't use it, it's fine (edit:or should be if you did bought it yourself,and didn't show it to anyone lol). Thanks for the GA, also welcome.

What store did you buy it from?

1) You should not create a giveaway if you're unsure if the key is used.

2) Your user name is the name you used when you signed up for the site, it does not reflect your Steam name.

If that is a retail copy (i mean a physical disc) the key pretty much won't work on Steam (even if no one used it) so if i were you i wouldn't take the risk.

Edit: Oh i just realized the "not at a store", still if you are not sure it's not used don't take the risk.