Although Van Persie took his tally to nine for the season with his goal at Fulham last weekend, after a sparkling debut campaign the Dutchman has not always looked at ease this term.
Arsenal manager Arsene Wenger cheekily suggested on Friday he still thinks of Van Persie as a Gunner ahead of this weekend's clash between the two clubs, in recognition of the eight years' service he gave to the north London outfit.
However, Moyes disputes that belief and claims from what he sees, Van Persie is perfectly happy where he is.
"I still think Sunday will be special for Robin," Moyes told MUTV.
"It is the club he played a lot of games for.
"But he has moved on now. He loves what he is doing here.
"In the time I have worked with him, he only speaks very highly about everything about the club.
"I went for a chat with him when I first got the job and he spoke in glowing terms about United.
"But obviously he had a great time in his early career with Arsenal as well."