The Box of Props contains:

Upgrades:
Horror Track Miniature
Deluxe Bloodlust Marker
Deluxe Time Marker
Deluxe Final Health Tokens

Promo Final Girls:
Layla
Agnes
Julia
Constance

New Components:
The Desperation Die: Once per game you may substitute a regular die with this die. 1-5 is a success, 6 is game over.
The Book of Desperate Deaths: Desperation Die deaths described.
Signature Action Cards: Assign your Final Girl one of these special signature actions.
The Ultimate Dice: Instead of unlocking your Final Girl’s Ultimate Ability, you may unlock the special powers of these Ultimate Dice instead.