They asked Crabbe to speak to him confidently and confessed their crime. If he would not denounce them they would willingly restore the money and give him part of the finders' reward. Crabbe agreed and was shown where the loot was hidden.
The individuals involved in a crime offered Crabbe a deal: confess to the crime, or they would return the stolen funds and give him a portion of the reward. Crabbe accepted their offer and was shown the location of the stolen goods.