Queensland man Tuhirangi-Thomas Tahiata has been found guilty of double murder after a jury found he helped dump two drug dealers locked inside a toolbox into a creek.

Cory Breton and Iuliana Triscaru's decomposing bodies were found in a large metal box at Scrubby Creek, south of Brisbane, on February 11, 2016.

After several days of deliberations, a Brisbane Supreme Court jury on Friday found Tahiata, 28, intentionally helped kill the pair.