Estate Agents of S.H.I.E.L.D.
Begin by talking to the good ol' Son of Coul on the outskirts of Nueva York.
He'll send you to track down the scouting reports of his agents. Find them as you would the informants in any rumour mission (ie by using the compass and map), but the important one is the agent in a far corner of Ancient Egypt.
Return to Coulson with the reports, but Egypt is the one that matches his criteria.
This is enough to complete the mission, and unlock Coulson for purchase.