I had 300 addresses and two of my addresses got lost in Multibit as well.  Well the addresses were there but not the transactions or the BTC.

So I exported the Private Keys to a file and I opened it in Microsoft Excel spreadsheet.

That will list all your Private Keys...long list of all of them but won't associate them with the corresponding public key.

So from there, you just go to Blockchain.info and you import Private Key.  You copy and paste each individual Private Key from the list in Excel (or wherever you have the Multibit private key list opened) and you paste it into Blockchain.info and sweet that amount of BTC into your blockchain.info wallet.

You have do this for each one, one by one.  I did 300 of them and probably took me 20 minutes or so.  But that way, you will get all your bitcoin out of all those multibit addresses.

Good luck and hopefully it will work.