I feel like they would get caught doing this pretty fast, both due to passengers complaining and the planeside scan being too fast. I think the RFID bag tag scanners are physically on the baggage claim too.
Nah. I talked to a ramper I know there and he said the guy at the belt loader has two scanners. Left hand is "Bag off plane" and right hand is "Delivered to Claim." They've been doing it for years and no one at Delta cares. After all it saves them money.