It reflects very poorly on the hotel that they allow military and paramilitary agents of a rogue third-world government to conduct "training exercises" on guests. I certainly wouldn't stay at the Revere Hotel.
I would not expect a $20/hour worker to challenge the authority of a group of FBI agents. Nor would I expect them to know the ins and outs of when a warrant is required and when it is not.
https://www.shouselaw.com/ca/blog/warrant/are-police-allowed...