First major fuck up, no doubt one of may more to come.

The obvious has been stated twice now with nary a response.
Send the losers an email and tell them to "validate" there keys immediately.
More importantly why? How can this operation be held hostage by this so-called requirement. No I doubt believe it is about being fair to them. Zero need to validate the keys, next to no one's saved passwords didn't work. Even so opening mainnet what the hell has that got to do with all of this

it is there "loss" even if there is a loss which I do not think exists.
And to all the whackos chiming in how it is a good thing things need to be done right, gives time to do things right blah blah blah mindless shills not even thinking about what is going on.
Send everyone an email. Open mainnet on time, with or without them, once live they will hear about it if they ignored the emails, most if not all will have success on their own with their keys, to the morons that forgot their keys tough luck. Split the booty amongst everyone and tell them to fuck off.
Or portion off that unclaimed balance, start mainnet minus it and go about over the course of the month chasing them down then reintegrate it.
Even simpler send an email each day remaining of this week. Those that don't respond, send back their funds to their sending address and be done it with.
Being held hostage like this does not bode well for the future. Developers need to seize control and run this show with a firm hand from day one.
Send everyone an email starting now.
Now if none of the above cannot be done them something else is very very very wrong. Be aware.
Good post, Im not so confident about Lisk anymore. Ethereum ICO was not managed this way..