If you cut an 2x4x81" out of an 8' wall, what happened to the other 11-5/8"? 81" (81-3/8") is a cripple/jack length framing member found underneath headers of the 2x12 nominal type with double top-plate above. Am I missing something? Are you suspicious that the previous person did sub-standard work unpermitted or is there some problem you've noticed?
(says I'm a noob, yes to the forum... I'm a 13yr custom framer in the field)