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When questioned whether Najib would be arrested, Grewal replied: "There is no indication".
The embattled former premier is to meet Malaysian Anti-Corruption Commission (MACC) officers on Tuesday.
A source from the MACC told theSun that the notice was in relation to the case.
He also questioned the timing of the search, which "denied the right" of Mr Najib's family and staff to properly conduct their religious obligations before the opening of fast on the first day of Ramadan.
Firdaus Latif, CC BY-SA 2.0)Najib led the Malaysian government for nine years before he lost the May 9 election.
Mahathir on Friday announced his cabinet of 15 senior ministers who will take their oath of office on Monday.
Amar Singh said the seized items included Hermes, Birkin and Louis Vuitton handbags.
Najib and Rosmah have been blacklisted by the Immigration Department, and can not leave the country.
On Tuesday, new Prime Minister Tun Dr Mahathir Mohamad said he expected Najib would be charged following allegations that the former prime minister siphoned off hundreds of millions of United States dollars from the 1Malaysia Development Berhad (1MDB) fund. His lawyer on Thursday denounced the long search of Najib's home as "harassment".
He said the items were believed to have been taken for the goal of investigation under the Anti-Money Laundering and Anti-Terrorism Financing Act 2001. The US Department of Justice, in its probe, found that Ms Rosmah had purchased a pink diamond worth US$23 million with 1MDB funds.
Police are still conducting search at the private residence of former prime minister Datuk Seri Najib Tun Razak in Taman Duta.
"This is the result of the search in one of the six premises", Singh said, pointing to the hundreds of luxury items seized from the condominium.
Sources said the raid was an evidence-gathering operation to especially seek documents related to 1MDB.