Un Soliciated Offer -> Most likely from BHP & Exxon Mobil...

Un Soliciated Offer -> Most likely from BHP & Exxon Mobil Jointly. BHP may be looking for 13% stake to replace Santos in next phase of PLNG.
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However, unsolicited offer means nothing. Market is flooded everyday with such rumors, Santos had, AWE had, WPL had(When it made for OSH), list goes on. Rarely, unsolicited offer ever gets materialized.
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TotalSA & OSH are partners in OIC largest gas fields. Who ever overbid OSH and TotalSA offer will have take OSH and TotalSA into confidence. Without their interest & consent taken into consideration, IOC cant make deal with anybody.
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.. Remember TotalSA and OSH are only operators on the ground in PNG, not IOC.