Paramedics say a man who walked into the Palm Beach Centrelink branch covered in cuts had not sustained the wounds in the past 24 hours.
Police are now questioning the man, after receiving a call from the office at 12.38pm Monday.
A Queensland Ambulance Service spokesperson said the man was not bleeding, and did not require any treatment.
How or when the man was wounded remains unclear.
He was to be questioned by police.