Is it correct to bring back the Airport Express ticket in the end of trip in Hong Kong?

I just finished my first travel to Hong Kong, where I used Airport Express to move to Hong Kong station and back to the Airport. However, on the return train, I didn't find the gate to insert my card into. And thus I brought back the ticket to my country.
However, now I'm uneasy about it; it might be that I made a mistake (possibly even crime). I just followed other passengers and no one seemed to insert the card.
But is it correct to bring back the card now? For your information my ticket is one-trip, two-way one which I purchased $180 using my credit card.
Best Answer
There is no crime in taking the ticket. A ticket can often be useful as a receipt for business expenses purposes, especially if you didn't get a receipt when you bought it. I'm not sure how you managed to get to the train without going through a ticket barrier in Hong Kong though. In any case you paid for the journey and have a ticket to prove it.
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[MTR Ride] Hong Kong Airport Express Train From Terminal 1 to Central Station
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