done. when security guards showed up for their regular morning shift and rang the buzzer, as they always did, they knew immediately something was wrong. they called their supervisor and soon the boston police and the fbi were on the scene. reality sunk in. $500 million worth of art was gone. there was no trace of the thieves. authorities got an idea of what the bad guys looked like from the two night watchmen. the only ones to see thieves up close. but it all happened so fast. they were tied up and blindfolded within minutes. watchmen rick abath gave this description of the guards to a stretch artist. >> the guy who was dealing with me was kind of taller and skinny. and was wearing this gold-framed like round glasses, if i