RS is both holing up in Dyster until he relearns how to talk normally around his new teeth and disturbingly accustomed to losing track of time, so even without getting caught in the looping mindset, it'd take him a bit to notice any deva ju... meanwhile Foo will just believe netpost warnings if she sees them whether she remembers past days or not.
so... I might do an RS "oh it's Valentines, I don't wanna mess that up with awkward apologies, I'll be back tomorrow" > "...wasn't yesterday Valentines?" > /asking what year it is and doing math to be sure he hasn't been sitting in Dyster for a year+ or something
I believe Pure Vanilla Cookie already plans to warn everyone on the repeat mornings, so I'm planning on Foo seeing that & being "that would be a weirder thing to randomly lie about than to have it actually happen here, so it's probably true :0"
"and once while trapped in a cursed necklace I blinked and 350 years passed, what's your point"