Since m/44'/0'/0' worked and the code you gave above, I think it goes:
m/44'/client_id'/0'
(either that or m/44'/0'/clientid'/0' -but that may be less likely)

How do you know the addresses generated have actually been funded though? I think you need a script thst goes through and checks from an api (such as a block explorer) as to whether an address you control has been funded or not.