Salesforce Offer Anxiety

I received a verbal email offer for a salesforce new grad role in Bellevue on Monday. I provided information this Tuesday and my recruiter said she received it the same day. She said I should get my letter this week or early next. I sent a follow up on Thursday and haven't heard back. I'm very insecure about the offer being rescinded, especially since this was offered to me after another candidate turned it down. Does the radio silence since Tuesday seem like a bad sign? #salesforce #engineering #software #swe #faang T. C: 150k