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.
They requested Crabbe to speak confidently and confessed their wrongdoing. If he refused to betray them, they would willingly return the money and offer him a share of the reward.  Crabbe agreed and was shown where the stolen goods were concealed.