Okay I didn't know. Just don't want to waste chances at loot because keys are limited, but my plan was to start with 28 anyway. Not really interested in going and farming for extra keys just yet beyond the 1 I got lucky for.
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You don't have to use your key on the level 28 one anyway. Although I would just go ahead because I'm pretty sure that the big chests loot pool is always the same. Did it on 28 but forgot my keys and didn't transfer them in time so we did the 32 and I still got the same type of loot as my friends did on 28.