Wow, I can't believe you went to PS and didn't eat at the 24/7 Oyster Bar! ?? (Or did I miss something in the story?)
I guess you'll have to go back.
Tip: It's slowest around 11am or so and generally busiest between 12m and 3am. It's not unusual to wait over an hour to 90 minutes because they only have a few seats.
Okay.. Super secret tip: Go to the Oyster Bar at Texas Station instead. It has the exact same menu and ingredients, costs a couple of dollars less per item on the average, has 10 times the space and far fewer customers. It closes at normal hours, though (like 11p or 12m or so) so check your watch/iPhone before going.
Other Oyster Bars at other Stations casinos will not be the same -- only those two.