Retirement tax questions

Hi!  In 2020, if someone took an RMD from their 403B account and returned it in 2020 in time, they get a 1099-R to show the distribution.   They are also being told that there is no form 5498 being generated to account for that money being returned, because my understanding is that NO 5498 is generated when putting money back into a 403B....  QUESTION --->    So, what form or schedule does someone use to account for that RMD that was returned into their 403B?