The tunnel contained several long-term living areas used by Hamas terrorists throughout the war.
The sources claimed the alleged deals included surface-to-air missile systems, radars, and military equipment.
It is unclear how far the case will go against one of Israel's closest allies.
Diplomats, the press and international research institute delegates have been invited to view the items from today through to next week.
Since September 3, police have arrested over 3,123 suspects and seized approximately 450 weapons in the operation.
The decision to increase military assets came right before the IDF's ground invasion into Lebanon that took place on Tuesday.
The additional $5.2 billion is focused on defense, including the Iron Dome, David's Sling, and an advanced laser system.
Egypt delivered a second large cache of weapons to Somalia amid shared mistrust of Ethiopia.
Legal challenges across Europe have also led other allies of Israel to pause or suspend arms exports.
Stubb said the time was not right to recognize a Palestinian state, even though its Nordic neighbors, Sweden, Iceland, and most recently Norway, have done so.