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.
More top news
As shoppers gear up for one of the biggest challenges in the bargain hunter's calender, Ashleigh Swan shares her top Black Friday tips.
Councils have until today to say if they plan to merge. Minister Leighton Andrews says joining together will create 'significant savings.'
Mainly cloudy, with a little patchy, light rain in the southeast this afternoon. Some brighter spells in the west at times.