Bolt, who completed a remarkable 'treble treble' of 100m, 200m and 4x100m Olympic titles at the 2016 Rio Games, had his 2008 relay gold stripped last month after Carter's re-tested sample indicated he had taken methylhexaneamine.
The International Olympic Committee (IOC) ordered Carter, who has already said he would appeal the decision to the Court of Arbitration for Sport (CAS), and teammates Bolt, Asafa Powell and Michael Frater to return their medals.
"Initially (I was) disappointed, of course," Bolt told reporters at Melbourne Airport as he arrived ahead of the Nitro Athletics series. "But in life, things happen. I'm not sad... I'm just waiting to see what's going to happen.
"But I gave up my medal."
Powell, who served a six-month doping ban for a positive test in 2013, was as phlegmatic as his storied compatriot.
