About the text, its incorrect to say that...

The museum is protected both by automated system, besides security men well placed.

The stolen artworks worth more if sold in legal market, rather than in illegal one.

There had been other heists in Netherland.

The director of the museum refused to provide information towards the way thieves got into the museum.

According to Art Loss Register's Marinello, thieves would never have the same profit the legal market has.