Days earlier, a "burner phone" had been bought from The Warehouse in South Dunedin.
Ten days after the consignment landed in the country, a $20 top-up card was bought for the phone and it was used to inquire about the status of the package.
Police inquiries identified Mitchell as the man who paid for the cellphone credit and he admitted as much when confronted.
He claimed to have bought it on behalf of an associate but refused to disclose any names.
On January 11 last year, police raided Mitchell's home where they found evidence of his dealing in class A, B and C substances.