Would it be against the rules to enter for a game I have in my inventory, but not my library?

I currently have a copy of Terraria in my inventory that I got in a trade, but I'm saving it as trade stock. I do want the game to play and it's hard not just adding it to my library, but I'm saving it to trade during the summer sale. So, would it be ok if I entered for Terraria giveaways still?

Edit: Yikes, wasn't expecting to get this many posts in my thread. I got the copy of Terraria in a trade with other stuff I already had, that was being saved to trade with for later. There's a game I want more than Terraria, so everything I have now I'm saving to trade for it. I only traded for Terraria, 'cause I thought I was getting a better bargaining chip for later trading than I had before. Hopefully my plan A works and I'll be able to just activate it on my account. Thanks for all the posts, some of them were pretty entertaining. :D