Matthew Friedrich, the assistant US attorney-general, said: "These items were not disclosed on Senator Stevens's financial disclosure forms, which he filed under penalties of perjury."
Under oath, Stevens insisted he had never accepted the gifts from the owner of oil services company VECO, who has benefited from the senator's work in congress.
However, Stevens failed to explain details about home renovations or why he had not returned appliances and furniture given to him.
The corruption trial began on September 22 and saw 24 government witnesses and 28 defence witnesses testify in court. Stevens testified in his own defence.
A sentencing hearing was set for February 26, the AFP news agency said, citing an unnamed court source.
The conviction is likely to damage Sarah Palin, Alaska's governor and the Republican vice-presidential candidate, who had endorsed Stevens for re-election.
Stevens had already been narrowly behind Mark Begich, his Democratic opponent, in opinion polls of registered voters.
He now risks losing his senate seat next week.