The news emerged after newspaper reports last week claimed Khashoggi's body was disposed of by dissolving it in acid.
Turkey's chief prosecutor said recently that Khashoggi was strangled as soon as he entered the consulate and also confirmed the body was dismembered.
The two experts, whom the newspaper described as "cleaners", reportedly visited their country's consulate every day for a week, before leaving Turkey on October 17.
A member of the consulate staff accessed the video system in the police post on October 6 and entered a digital code that did not dismantle cameras but prevented access to any videos that could have shown the writer entering the building, the report said.
Son said he went to the country, but skipped the conference, instead sharing his concerns with Saudi officials.
Salah Khashoggi, 35, a dual US-Saudi citizen, and his brother, Abdullah, who lives in the United Arab Emirates, spoke with CNN in an interview that aired Sunday and described the past few weeks of uncertainty.
Prince Alwaleed told Fox News that an official Saudi investigation would show that the crown prince was not involved in Khashoggi's killing.
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Fentanyl was originally developed as a painkiller and anesthetic, but it's 50 to 100 times more potent than heroin. The rapper, whose real name was Malcolm James Myers McCormick, was generally healthy otherwise, the report stated.
A Turkish source also told Al-Jazeera on Tuesday that Ankara had briefed Central Intelligence Agency director Gina Haspel and European officials on the "full picture" of the Khashoggi murder, in an attempt to increase American and European pressure on Riyadh to disclose more details.
Khashoggi's remains are still missing.
"I really hope that whatever happened wasn't painful for him, or it was quick".
Meanwhile Turkey's president, Recep Tayyip Erdogan, has said Mr Khashoggi's murder by Saudi agents was premeditated and that the order to kill him "came from the highest levels of the Saudi government", though he has not specified who he thinks was responsible. "He died", Abdullah Khashoggi said.
The delegation was headed by Bandar Al Aiban, who said the Saudi King had personally ordered a probe into the killing of Jamal Khashoggi.
Forty member states reiterated their request for an investigation, as well as reform of Saudi Arabia's laws regarding freedom of expression.
But U.S. Charge d'Affaires Mark Cassayre appeared at the meeting in an observer status, saying that a "thorough, conclusive and transparent investigation (of Khashoggi's death) carried out in accordance with due process with results made public is essential".