The Clutha-Southland MP has not been at work in Wellington since his decision to resign at the end of this parliamentary term, following allegations he secretly recorded a staff member at his Gore electorate office hit the headlines again last month.
Mr Barclay has avoided answering any questions from the media since it was revealed he told Prime Minister Bill English that he had recordings of staff criticising him.
Tuesday was no different, however he did smile and offered a happy "good morning" to a camera crew waiting for him at the building's front entrance.
It was not clear if Mr Barclay's return to Wellington this week meant he would stay the final four weeks of the term before Parliament rises ahead of the election in September.
Mr English, when asked on Monday, was unclear on whether Mr Barclay would also take up his position on select committees.
He is deputy chairman of the Education and Science, and Primary Production select committees, both of which meet this week.
Mr Barclay's workload since his decision to retire has come under scrutiny in recent weeks.
After appearing to take some time off after the allegations resurfaced, and police relaunched their investigation, Mr Barclay posed for a picture on his Facebook page with a caption indicating he was "working on constituent issues".
Since then the page has been flooded with pictures of Mr Barclay posing with various projects and a flashback photo from his childhood.
