The investors are getting answers in appropriate communication channels which are not troll-infested such as this one. Tl;dr: Nothing is missing; the escrows (including coinpayments, who apparently nobody is going after because their name isn't Lauda) have done their job accordingly; there are more funds than what the milestones require.
Sign an address with the funds. It is that simple. Failure to do so can only be described as you being incompetent, a liar, or a scammer.