Among the objects seized during last week's raids were "apparently explosive papers" which Dutch investigators hope may narrow down the search for those behind the 2014 tragedy, said the daily De Telegraaf.
All 298 passengers and crew -- the majority of them Dutch -- died when Malaysia Airlines flight MH17 was hit by a Russian-made BUK anti-aircraft missile while flying over war-torn eastern Ukraine on July 17, 2014.
The Boeing 777 was en route from Amsterdam to Kuala Lumpur.
According to the Dutch paper, the private detective was paid some 17 million euros (USD 19 million) by a rich donor -- whose identity remains unknown -- to investigate the causes of the crash.
Identified only as Josef R., the detective began his inquiries two months after the disaster, having been initially promised a fee of some 30 million euros.
"We are hoping to get some information about this. That's why the raids at his home were carried out," the spokesman for the prosecution service, Wim De Bruin, told AFP.
"We don't actually know what was in the box. The Swiss judge must now decide if its contents can be handed over to Dutch officials," de Bruin added.
The news comes after Dutch investigators yesterday released an update on their inquiry to the families of the victims. It included pictures of fragments of the BUK missile found at the crash site.
The same pictures were also included in the final conclusions of the initial Dutch-led international investigation, which determined in October that the flight was shot down by the Russian-made missile, fired from an area in eastern Ukraine held by pro-Russian separatists.
The first official findings by the criminal investigators are now expected after the summer, as they await further information from Russia.
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