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Never had to but your claim must be within 120 days of your purchase or payment for service.
Kickstarter did nothing to help out. This was sufficient evidence for my credit card company though. I talked with them and filed for the chargeback the day after the alleged delivery month. They returned the money provisionally, but gave KS some time (1-3 months, don't remember exactly) to dispute the chargeback. KS did not.
If you're bored and want some entertaining reading, the Comments and Updates here unveil the whole sordid tale (in reverse order reading now):https://www.kickstarter.com/projects/dinaandrewswalker/miniature-ice-age-mammal-adventure-set/description