One of my clients got a letter exactly like you mentiond.. odd thing though in this case we were already making the 941 deposits by the following wednesday after a friday payroll date.  Offering payroll to a couple of dozen business clients I don't count on my clients getting that letter or if they do, forwarding it to me.  Your post also reminds me to get ready for 2024 now as the look back window is July 1, 2022 to june 30, 2023 to see if any 941 taxes were over $ 50,000 in that period.