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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Services will be held across Wales today to commemorate 100 years since the Battle of the Somme, the largest battle of the First World War.
As Wales prepare to play Belgium in just their second quarter-final at a major tournament we take a look at how they got on 58 years ago.
Some sunshine out there at the moment but my advice is to make the most of it! There's wet weather on the way!