In the side quest "Patric and the Idols", Patric Cardone tells you that he's been swindled by a Spaniard named Teodoro Fernandez. The tavern keeper recognises Teodoro's description but not the name, and says he was talking to Lucien Bescanceny. You go to Lucien Bescanceny's house, have a little chat about statuettes, then report back to Patric that you've found the statuettes and the thief.
If, after leaving the tavern, you talk to Patric first, he says Teodoro ran into a house next to the church. There you find Raoul Calmes, who denies knowing Teodoro but says someone ran out of the back door. You can then "persuade" him to let you read a letter, which ties him to smuggling. Now you can talk to Patric again and tell him you've found the statuettes and the thief without ever going near Lucien Bescanceny, meaning you have in fact not found either the statuettes or the thief.
If you visit Lucien Bescanceny first and then report to Patric, he'll still send you to Raoul Calmes' house so you can get the letter. That letter isn't for Patric's quest, it's your evidence that you know who's behind the smuggling which is a problem for portmaster Turpin Cabanel.
If, after leaving the tavern, you talk to Patric first, he says Teodoro ran into a house next to the church. There you find Raoul Calmes, who denies knowing Teodoro but says someone ran out of the back door. You can then "persuade" him to let you read a letter, which ties him to smuggling. Now you can talk to Patric again and tell him you've found the statuettes and the thief without ever going near Lucien Bescanceny, meaning you have in fact not found either the statuettes or the thief.
If you visit Lucien Bescanceny first and then report to Patric, he'll still send you to Raoul Calmes' house so you can get the letter. That letter isn't for Patric's quest, it's your evidence that you know who's behind the smuggling which is a problem for portmaster Turpin Cabanel.