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7 day streak unfortunately don't guarante obtaining an evolution item
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It must have an added bonus chance on the 7-day spin. Myself, my girlfriend, and many others that posted here, got it on the 7-day spin bonus. I've spun >100 (maybe even 200) pokestops since gen2 and the ONLY evolve item I got was from my 7-day spin.
Basically, if it was strictly same probability and just the number of items was the extra probability, we wouldn't have seen this. 20 items from a single spin versus 300-600 items from 100-200 spins - you do the math.
Although that's some pretty rotten luck you had there :( I notice there's one Nanab berry. I'm dreading to think that 7-day and even first-of-day bonuses just guarantee something new (as I've gotten a nanab or pine on each daily bonus).