Open future possibility?

Still he might have told them except he was sure, sooner or later, that they would want to take him away from the hotel.
Source: The Shining

Hi. Does the "might have told" express "open future possibility", as in "By the end of this year I might have saved some money."?
Or does it imply a condition ----- "if he had not been sure sooner or later, he might have told them"?

Thank you.