Police said the matter came to light when Satyarthi's PA went to take his car from the activist's Kalkaji residence around 9 AM.
Police was informed about the alleged theft of the Nobel Prize replica and teams are collecting fingerprints and analysing the spot to get details of the items stolen.
Police said all the lockers have been broken and it is suspected that the burglary took place in the wee hours today.
"The Nobel Prize replica has been stolen among other things. His daughter's wedding jewellery is also missing. They haven't yet shared the full list of the items that are missing and currently the inspection is being done," said a senior police officer.
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Cops suspect that the information that there was no one atthe house might have been leaked by someone from the society like a milkman or a newspaper delivery boy, etc.
Police is questioning local criminals of the area to gain leads to the burglary. They are also looking at the CCTV footage to gain clues to the accused.