So EA said that there's no way even for them to check whether or not a game code had been redeemed or not, which is unfortunate and honestly quite hard to believe but I guess I'll have to figure out some other way to do this. Thanks for your help and input!
If you have the game codes on hand, you can maybe find which one(s) are in use by going to your Games Library > Sims 4 > Right-click and select Game Properties. Compare the one shown to the others you have on hand.
If that doesn't help, go with what Crinrict suggested - Give one out at a time and if it doesn't work, try another.
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