Well, i dont know what to think, i heared a lot players who had thier radars disappear. Some even claim thier glasses did disappear too. It causes confusion. Propably they are supposed to stay but as it looks u can never be too sure i guess
My radars disappear too... When I use them as Kurito food.
You guys are just doing it wrong. I start stockpiling at the beginning of phase 1 and they are all gone by the time the event ends
Of course, the 12+ hours i spend in front of my computer doesn't help me get more pink boxes or anything... I love having a job that lets me get away with playing games all day...