Chen was arrested during the operation, with 75 boxes containing three pods each and 110 vapes found at the store. Some of the pods were found in his locker at the store.
At about 8pm on the same day, HSA officers searched his home and found 251 boxes of pods and 409 vapes.
Chen admitted to owning all the items, while claiming that some were for his personal use.
CNA has contacted Harvey Norman for more information.
Those convicted of importing, distributing, selling or offering to sell imitation tobacco products face a fine of up to S$10,000, up to six months in prison, or both for their first offence.
Those convicted of a second or subsequent offence face a fine of up to S$20,000, up to 12 months in prison, or both.
It is also an offence to purchase, use and possess such products, with each offence punishable by a fine of up to S$2,000. Any prohibited tobacco items will also be seized and confiscated.