Alessandro Meda Riquier said 51 of his books were being stored in the building near Heathrow Airport before they were due to be flown to an event in California.
In total, some 160 publications worth more than £2m were taken in last month's audacious burglary, which has been likened to a scene in Tom Cruise's Mission: Impossible.
Three raiders reportedly climbed onto the roof of the warehouse in Feltham, west London, drilled through skylights and abseiled 40ft down while avoiding motion sensor alarms.
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