Can but need to wear a cap and mask.
Better wear a clothes type that you usually doesn't wear.
The transaction that made will have a time and the shop can playback the cctv for that specific time.
Just make sure you will not be recognised and can buy song song to jurong. Remember don't talk much.
Also remember that you are still not saved after leaving the shop unrecognised.
Becos crime watch shows that polis can trace you from cam to cam until somewhere then the tracking will be lost.
Don't be a goondu to take a taxi. That's the stupid thing criminals do to let polis trace them song song to jurong.
Follow my advice and you will be saved.
However you need to weigh it. Is it worthwhile to go through so much trouble just to buy something free?
I would think yes it is worthwhile but you need to buy something very expensive.