The pride of Scotland is still waiting to take delivery of the trophy he so famously won in an emotional five-sets victory over Serbian defending champion Novak Djokovic in September.
While Dunblane's most famous son was pictured parading with the historic trophy after his win in Flushing Meadows, he said he is not expecting to get his trophy until December.
The 25-year-old Scot, who is the world number three, spoke after fighting back from a set down to beat Czech Tomas Berdych at the Barclays ATP World Tour Finals at London's O2 Arena. It was his first match in the UK since he banished his Wimbledon Centre Court demons and won Olympic gold.
He followed that by ending his long wait for a grand slam title in New York. Of the trophy, he said: "They haven't delivered it yet."
He added with a smile: "I won't have it until December, can you believe it?"
The winner in New York gets a same-size replica of the US Open Trophy, along with nearly $1.9 million (£1.2m) in prize money.
Murray had lost four Grand Slam finals to share an Open-era record with coach Ivan Lendl, but like the Czech he triumphed at the fifth time of asking in the US. He was the first British men's singles winner at any Grand Slam since 1936.