Before someone jump on board - I have been farming keys for more than 2 weeks and had more than 10 rings made - so I know how it was like. The drop rate had never been THIS bad. Yes I have 5NVs on this 20 runs stretch.
RNG, I know. But the chance of 2 keys only after 20 runs in MP6/MP7. Seriously? THAT bad a cold streak?