Authorities first detected Emin Yavuz, 25, when Customs officers at a Sydney mail centre detected a package containing 50 grams of a "pink amphetamine paste" in November last year.

The package was destined for a Civic post office box owned by a man named "Joseph Bolovski", court documents allege.

The mail was sent on its way and police allegedly allowed Yavuz to pick the package up while being recorded on CCTV.

His Franklin home was later raided and police allege they found post-it notes recording a series of mail tracking and consignment numbers.

Police allege they also found fake licences under the names of "Joseph Bolovski" and "Stephen Angello", and 11 keys to post office boxes across Canberra.

Two mobile phones were also found in the garden, and police believe Yavuz threw them out the window as police went inside.

Police say they asked Yavuz about the items during the search, but he did not comment.

The investigation continued after Yavuz's initial arrest.

Authorities seized more packages destined for post office boxes and local addresses, and tracked consignment numbers for deliveries from locations including the Netherlands, New Jersey, the United Kingdom, and China.

Many were allegedly addressed to IT companies, such as "Scotch I.T", "Spiral I.T", and "Blue I.T".

Yavuz is now facing 37 charges, mostly relating to the importation of a marketable quantity of a border-controlled drug between September and December last year. He is also facing attempted drug possession and identity fraud-related charges.

He appeared before Magistrate Beth Campbell on Thursday, represented by lawyer Michael Kukulies-Smith, and pleaded not guilty to all charges.

Yavuz was committed to stand trial in the ACT Supreme Court and will appear in the higher court later this month.

He remains on bail.