For Obduction, the Myst 25th Anniversary Collection, and Firmament Kickstarters, Backers’ Physical rewards were required to be claimed within two (2) years of the start of rewards distribution.

NOTE: The physical and digital rewards for Cyan’s Obduction, Myst 25th Anniversary, and Firmament Kickstarters have now been claimed and no replacements are available.

These were the Kickstarter reward claim deadlines for Obduction, the Myst 25th Anniversary Collection, and Firmament:

Obduction
August 24th, 2016 (release date; reward distribution began)
August 24th, 2018 (final date for physical rewards) (Now CLOSED)
August 24th, 2021 (final date for digital rewards) (Now CLOSED)

Myst 25th Anniversary
July 3rd, 2018 (reward distribution began)
July 3rd, 2020 (final date for physical rewards) (Now CLOSED)
July 3rd, 2023 (final date for digital rewards) (Now CLOSED)

Firmament
May 18th, 2023 (reward distribution began)
May 18th, 2025 (final date for Physical rewards) (Now CLOSED)
December 5th, 2025 (final date for Digital rewards) (Now CLOSED)