An article on TechnoBuffalo.com mentions the possibility to take in-game photos in Firewatch and develop them as physical photos. This option is an in-game feature for PC version alone and the photos can be ordered by players and they are delivered to one’s address, for USD 15 and free worldwide delivery.
http://www.technobuffalo.com/2016/02/08/firewatch-pc-photos-developed/
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