I guess your list of imported private keys is incomplete ... which command did you use to see the addresses? The list in the qt wallet or the command listaddressgroupings?
Try listaddressgroupings (in the Debug console or with the slimcoind daemon) and check if there is any address missing where you still have to import the private key into the new wallet. listaddressgroupings (afaik) lists all addresses which were used at least once to send coins, so the addresses to access your burned coins should be definitively there.
listaddressgroupings
Method not found (code -32601)
i just open my wallet.dat in notepad and found all addresses by searching for word "name"
Were you able to solve your issue?