Read the story for the full details, but someone carried out a Mission-Impossible-style theft of a safe that just happened to contain four million dollars in digital tulip bulbs. Luckily the robbers won't know about that - that's four million dollars, $4,000,000, four million in case you missed it, but don't tell the robbers - with no traces left behind to identify anyone involved.
OK, it could have been a genuine burglary, but it seems more like a convenient way to vanish $4m off the books, since there's no way to prove or disprove what happened to the funds.