Ah sorry I used the Bip39 mnemonic program recommended by coinomi. I used it for bitcoin cash and there were about 20 keys so I scanned them all, lots had nothing in, a couple had a small amount and one had the majority. Nothing like this though.
Did you try changing the "external/internal" value from 0 to 1 to generate your change addresses as well? Try that and scan through a few of those addresses... ps. the BIP39 mnemonic tool will generate an infinite number of addresses (at least, until your PC runs out of memory)
Unless you have made thousands of transactions, I doubt your coins in receive or "change" addresses are likely to be further down the list than 100 or so 
