That is what it is about or not?
You use a skill and succeed you want it to work out. Stealing is all about not getting caught. And even if the NPC realizes that, it should be reported to "security" and not just accuse the party. In case of the Grove, suspicion should be with the tiefling kids since they seem kinda
notorious for that.
Even if the theft gets recognized right away, the question to the party should be: "I have been robbed, have you seen anything suspicious?" and not an outright accusation (even if you can just say no) That just feels like you failed
