Originally Posted by Bouncer

Can confirm, though usually they are the last to board and the first off, as they have to wait for the cargo hold to be closed and locked before they can go to boarding. It's possible the cargo load itself was delayed waiting on the courier bags and then that delay rolled along. I wonder if OP was able to see the bags being loaded, and if they were all loaded before boarding began.

Regards,
-Bouncer-