This isn't lost property though. This is where the airline can't find an item of checked luggage. It would be a totally different stream to that for leaving a phone or coat at security or gate area etc

Since it has been more than 21 days the bag will have been deemed permantly lost so the OP should be contacting Ethiopian for the statutory compensation under the Monteal Convention

1,288 special drawing rights is currently around £ 1,350 / $ 1,700


And this is a general remoder that a lap top should never be put in checked bags.