CMK10,
I wouldn't think you'd have any problems in general, as long as you can still produce an Amtrak ticket. As in be careful if you use eTicketing via the Amtrak App as your reservation might not come up after your ride.
And NO, I would not leave my laptop with them! And officially they are not allowed to accept a laptop either. If they know that you have a laptop in your bag, they will refuse to check it. Or at least they should refuse.