Well, it's one of those things... If one really cares about it, they'll keep track of everything. (I'm not saying you don't care.)
Personally, I would rather just believe GREE did the right thing and not bother checking thru my invemtory for rewards. My ignorance is bliss.
I don't mean to sound apathetic, but I play for the fun of it, and one unit isn't gonna make or break me.
Since we don't know our actual final rank, it would be hard to contest it anyway. The LB froze us at rank 122. Usually, we place T100. I would expect to see the T100 reward in my inventory, but maybe we placed 101, idk.
About changing syndicates after any event, they know who was in what syndicate during the event. Rewards are issued from that snapshot, so changing syndicates afterwards shouldn't be an issue. They know players move around a lot when syndicates are open.
If anybody has screen shots of that SA's rewards, please post!
I might look thru my inventory if I knew what the rewards were.