Does God hang onto His receipts?
You better believe He does. He embraces His Son, who said in Aramaic on the cross, "It is finished"--the same language used in His day to communicate, "It [the debt] is paid in full." Paul told the Corinthians, "You have been bought with a price." The very literal meaning of the word, "redemption" or "redeem" means "to buy back."
When the resurrected Jesus appeared to doubting Thomas, He still had His wounded hands. I believe the "receipt" Christ keeps for eternity is the scars of those wounds: He paid for our sins by receiving them--by becoming sin (2 Cor 5)...Peter added that became a curse for us.
Jesus suffered more than what The Passion showed. That showed His physical anguish, and, to some degree, His spiritual and mental anguish. But it did not and could not depict what it was like to be separated from the Father for the first time in eternity (to become accursed); to receive the full wrath of the Father for every sin we've ever committed (all of humanity); to literally be sin.