Leave Animus, and go to present day Monteriggioni. You will find these artifacts lying 
on the shelves in your sanctuary.
Mario?s Sword

Search the street south of Villa, and you will come across it lying beneath the tree. 
Medici Cape

You will find it in southeast of Monteriggioni Eastside Church 
Claudia?s Record Book

You will find it inside Mario?s Library, just beside the back door.

Maria?s Feather Chest

Lying on Top of the Villa, use the rope to reach there.
Ezio?s Belt

Search the south east corner of Monterigioni, and you will find it in the lower roof of the 
small building.----N.A----