The weapon to all appearences will appear to be a +5 sword until in battle when a qualified person swings the suddenly heavily unbalanced sword.
Gold and silver full plate mail with the soul of a Slavina General trapped inside.
Plain looking dagger. However, when the dagger is seen in the light of an open flame Jamil’s hand print is on the hilt from where he gripped it in his death.
Set of Lockpicks. The picks themselves are of tiny size that only a halfling or smaller can use. There are only a quarter of the usual amount of picks in this kit. Each pick is made out of a dull silver metal.
The player characters, experienced and somewhat well known, hear rumors and travelers' tales about a distant area being overrun by dragons (or other terrifying monstrosities). The locals have sent them a message, begging for heroic aid.
When they investigate, they discover that nothing of the sort is going on. It turns out that a group of thieves wanted them out of the way so that they could rob them (or someone who would normally receive their protection).