He also told AAP the passenger sat next to him thought it was a chipped tooth and confirmed their story to the news agency.
So far, his compensation has been a $75 voucher for duty-free purchases redeemable on Singapore Airline flights.
An apology has been issued to Button by Singapore Airlines and according to AAP the object will be tested in Melbourne.
"We are currently investigating this incident and have sent the object for analysis. Once the results of the analysis are known, we will determine what the most appropriate course of action to take is," a spokesman said in a statement.