The USB memories will now be analyzed and included in the man's asylum case.
The 26-year-old was taken to Oslo on Monday.
It was during the night of Friday that the man fled across the Russian-Norwegian border.
- He has been part of the Wagner group and it is clear that he is sitting on relevant information in a war criminal context, says Brynjulf Risnes to VG.
"Fooled by the state propaganda"
The man has previously claimed to have video of deserter executions carried out by the Wagner group.
The 26-year-old volunteered for the private military group this summer and says he signed a four-month contract.
The man's lawyer tells VG that he was deceived by the state propaganda and realized that the war was wrong as soon as he arrived in Ukraine.
When the four-month contract expired, he was reportedly told he had to serve another six months.
Then he chose to flee.
- He felt that there was no way out.
That it was not possible to terminate the agreement, says Brynjulf Risnes to VG.