He was believed to have started his acts of mischief on November 8 last year, when he swopped the baggage tag of a Penang-bound piece of luggage with another bag. The baggage tag had a serial number indicating that the Penang-bound bag was supposed to be transported on a Singapore Airlines flight. It was not made known Tay's motive for carrying out the acts.
Tay is believed to have subsequently swopped around baggage tags almost every day for three months until this February. These bags were heading to places such as Hong Kong, Manila, London and Perth. Besides Singapore Airlines, they were also supposed to be transported on carriers such as Silkair and Lufthansa.