Police said that their investigation has revealed that the blast that killed Ambassador Jamal al-Jamal on January 1 did not occur inside the safe and no explosive device was part of the safe.
The cause of the explosion remains unclear.
Police spokeswoman Andrea Zoulova said that "mishandling remains the most likely option."
"There's a question whether he knew what he was dealing with," she added.
Police said in a statement that they need several more weeks to complete their investigation.
Palestinian authorities have said the weapons were gifts from officials in Czechoslovakia during the Cold War.
The ambassador's death is being investigated as a case of negligence.
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