Nexus Blitz - How to get the sled ?

Alright guys, I played approx. 40 games of NB and I'm almost done with the missions which rewards you with Nexus tokens (thanks to Lethality MF). But I have not seen any battle sled as reward of NB events ingame, neither when my team won nor when the enemies won. Does anyone here has an idea why I haven't seen any battle sled yet ? Does it requires somthing more than just winning an event ingame ?
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