Too many people participated in the robbery, they can not share the stolen goods and will have to remove some of the participants if greed takes over.
As they will not be able to share? They stole a huge sum. There's almost a million for each member of the gang. Such a sum they can easily share.
They might have already shared the loot, and dispersed to various countries, such as Brazil and Bolivia. The Brazilian region bordering Paraguay is mostly
pantanal (swampland) and these people can easily remain hidden for many years.
I certainly do not support such methods, but the money people stole a lot. To Paraguay and Brazil, it is generally the cosmic jackpot. Although I doubt with that kind of cash they can go unnoticed. They will still spend the money and it will be noticeable.