Does taking money from the questioner by a swindler, in the same amount as the stolen goods the questioner took from the storehouse, expiate his sin?

You have made a grave mistake by taking what is not yours from the store. This is a betrayal that necessitates repentance and returning what you took to the store, according to the hadith (definition): "On the hand is what it took until it returns it." You are not excused from returning it by the fact that you stole its equivalent value; what you took is binding upon you, and your conscience will not be cleared until you return it.