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Could be accidental purchase. If customer will notice his mistake, he can ask and get a refund. Happened to me few times. One thing to keep in mind about this - cgtrader is not sending notifications to the sellers about issued refunds, so you may want to keep your eye on your sales page if you don't want to get surprised when you'll get lower than expected payout.
FYI, the buyer bought the said model 1 hour after he bought the bundle, so i think it was unlikely to be accidental, i hope lol