New Zealand's Players' Association has stepped in to help McCullum, one of the biggest names in the IPL, recover his money.
"At the moment it's difficult to locate anyone within the old Kochi franchise to deal with on the matter," association boss Heath Mills said.
"We think we'll end up dealing with the BCCI about the recovery of money owed."
Fica, the international players' association, is working on behalf of other players, and the prevailing view is that the money will be paid out, but may take time.
There is a smaller-than-usual IPL auction set down for February 4. Using a clean slate after the first three seasons, players were last year signed to fresh contracts for three seasons, but which allows franchises to terminate it after two.
Eight New Zealand players are involved - Dan Vettori captains Royal Challengers Bangalore, Tim Southee and Scott Styris are at two-time defending champions Chennai Super Kings, New Zealand captain Ross Taylor is at Rajasthan Royals, Nathan McCullum and Jesse Ryder are with Pune Warriors and James Franklin is at Mumbai
Around a dozen New Zealand players have put their names forward for next month's auction.