Answer:
Wrapped in a paper bag stored in a cool location
Step-by-step explanation:
If you wrap it in a ziplock bag the moisture from the blood will most likely cause it to mold.
a sealed box in a cars backseat will eventually get very warm and will cause mold.
a paper bag was a good choice but the warm location was not.
so the final answer would be a paper bag stored in a cool location.
(also thats what they do for other blood samples; store them in a cool location)