Amen..
Cooper's jump happened on Thanksgiving' eve.. which would've been a perfect 4 day weekend (Thur-Sun) for him to carry out his theft, and hike back to his homebase. This is why I've always believed he survived (but lost the $). After the jump, (I suspect) he went right back to work on Monday morning. If he died on Thanksgiving, and never returned to work, or family get-togethers.. his sudden disappearance would've been noticed.
And with the incredibly detailed, highly publicized composite sketch(es), it seems likely a co-worker, neighbor, or family member would've linked Cooper's Thanksgiving week disappearance with the Thanksgiving crime.. which didn't happen, so I don't think he did die, even tho it was a reckless jump.