The ticket number should be in the QR code of the BP? Miles and more allows retrocredit by just scanning the QR code on the BP of the flight you want to claim, so they should have all the info in there. IATA info on BCBPs :
https://www.iata.org/contentassets/1...version-7-.pdf
BTW, since LO rebooked you, the entire ticket is on 080 stock, SAS will not get involved there. And the new 080 ticket number you have for CPH-WAW is most likely the one same for DUS-CPH, just the coupon number will differ.