What do M. and Mme Loisel do next?

When M. and Mme Loisel discovered that the necklace was lost, they tried to find it. Mr. Loisel went out to look for that in the cab which dropped them to their house. When he was unable to find it, he went to the police. He even put an advertisement in the newspapers, offering a reward. Then, he thought about an excuse to explain the delay in returning the necklace to Mme. Forestier.  He asked Matilda to write a letter to her friend explaining that she had broken the clasp of the necklace and would get it repaired. This gave them time to find the necklace. Eventually, they had to replace the diamond necklace with a new one.