Supreme Court spokesman Drazen Tripalo told Hina on Thursday two verdicts were upheld but would not which sentences the two men were given.
The Zagreb County Court sentenced Luka Matanic and Mafalani to 16 years' imprisonment each in November 2010.
The other three accused have been in custody since the end of October 2008.
County court Kresimir Devic said the court would decide on extending their detention on Friday.
Robert Matanic was sentenced to 33 years' imprisonment pending appeal, Guduric to 30 and Djurovic to 15. Zeljko Milovanovic was sentenced in his absence to 40 years' imprisonment.