I wonder if this was some ICO issuing unannounced refunds? It came in over a week ago but I just now noticed it:
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Can you list the amount of ICO that you have invested at pretty much ever? It's funny because some people went compulsively investing on every single ICO in town during the ICO hype thing and a some of them never got anywhere, this made people get their ETH back a ton of time later and they didn't even knew that invested on there. Some people isn't able to track back what exactly they invested at and what amount because they went into a ton of ICOs.