I know it took me forever to get my wallet synced, and I can say I had most of my icoin over a few addresses so im not on the first page list, although i think i have one i recieved ~90,000 on.
I had my wallet not sync for over 6 months when the network died. i had almost lost hope but a small few kb file was worth holding onto and now its back up and running lol, so who knows how many bad hds/reformats lost their wallets.
now we have the rich list we can check, I have calucaulated about 4 million coins haven't become active since the revival, that is only from the top15-20 on the rich list.
I never delete any wallets, but I'm sure a few people will have done