may have been lost or might have been?

[ostap77]

If the actual words were, "The papers might well have been lost", I would interpret th words as implying a stronger possibility of loss than that implied by both 'may have been lost' and 'might have been lost'.

If you thought bad things about a person but he turned out to be a nice guy, would you rather say "I guess I might have been wrong about him." or " I guess I was wrong about him."?

[5jj]

If you thought bad things about a person but he turned out to be a nice, would you rather say "I guess I might have been wrong about him." or " I guess I was wrong about him."?

"I guess I might have been wrong about him." suggests to me that I admit the possibility that I was wrong - but reserve the right to believe that I was not.

"I guess I was wrong about him." is an inconceivable statement for me. It suggests that I was wrong. (And I never say 'I guess'.)