"Some of the bodies are not recognisable and need DNA testing to get them properly identified, some are badly damaged," a senior police source said.
It was not immediately clear if the bodies recovered have already been included in the official toll of 67, including 61 civilians and six Kenyan troops or if they could be among the 39 people listed as missing by the Red Cross.
Somalia's Al-Qaeda linked Shabab claimed responsibility for the attack on the shopping mall.
Part of the rooftop parking of the mall collapsed after heavy explosions and a fierce fire, leaving the key area where the insurgents are understood to have made their final stand, along with possible hostages buried under tonnes of concrete slabs and rubble.
In addition, Kenyan officials have said five attackers were killed, but it is not clear if all or any of those bodies have been recovered.
Families of those missing have been called to the central mortuary to provide DNA samples to help identify unclaimed bodies, officials said.