I've tried right clicking on the file in the chest and selecting both 'restore' and 'restore and add to exclusion list'[b] but the file remains in the chest[/b],
a copy of the file will remain in chest when you restore


Avast 2015: Using the Virus Chest
https://www.avast.com/en-eu/faq.php?article=AVKB21#artTitle