Specialist officers from Dyfed-Powys Police, along with others from other forces, have been searching the area in and around Machynlleth since the beginning of October.
The force says the search areas identified during the course of the investigation were completed on Friday.
47-year-old Mark Bridger has been charged with murder, abduction and intending to pervert the course of justice.
He denies all the charges.
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A pleasant end to the day with late evening sunshine for most. However, skies will soon clear and it'll turn chilly with light winds.
Three men have been arrested after an incident this morning in Cardiff. Two people are in a stable condition in hospital.
Pictures posted on twitter show an officer with a bandage around his head and blood on his neck