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I actually went for just 'reward' in the translation, but this is the meaning of the phrase, which is what I was asking for, so I have to give points here. Thanks to everyone else as well though! 4 KudoZ points were awarded for this answer
Product is a moisture/humidity absorber (those little pots that you put in cupboards to prevent damp). Text around it reads: "WANTED - PRIME DE CROISSANCE IMPORTANT - [picture of product in style of police mug shot] - SE VEND TROP VITE - LOW COST - ATTENTION: IL EST DISCRET, MAIS IL SE VEND TRES VITE, ABSORBE A TOUTE VITESSE AT NE LAISSE AUCINE TRACE D’HUMIDITE"