Near 100%. Yeast are actually happier in that temperature, they just don't make great beer when fermenting there. A few of them may have died, but since you're making a starter anyway it just isn't going to matter. Even if the ice pack was melted, they were still insulated, too. The interior temperature of the package was definitely plenty cool.
I can't be arsed to keep up this list of what's in the fermenters, but hey, check out the cool brewery I own!
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