If it helps, my short form list of 458 & 455 that have not worked in passenger service for over a month is below, with the last date that I have noticed them appear on a passenger train on RTT. This date is not guaranteed to be 100% accurate, but it shouldn't be out by more than a day or so.
458502 26/02/22
458506 unknown
458522 09/10/21
458529 25/08/21
458535 unknown
List excludes 458507,517,533,534
458509(27/03/22) and 458521(23/03/22) are the only other 458s that have yet to work in April.
455713 16/02/22
455719 27/01/22
455722 15/03/22
455740 unknown
455848 29/09/21
455854 21/02/22
455907 28/02/22 *
455909 18/03/22
455913 unknown
455918 28/02/22 *
455920 17/03/22
List excludes 455704,726,736,847,855
* Last date in passenger service for 455907+455918. On 30/03/22 they were moved to Clapham Yard, and 18/04/22 from Clapham Yard to Strawberry Hill (perhaps for storage?).
455707+455727 last worked in passenger service on 29/03/22, moving to Bournemouth the following day.
455905(31/03/22) is the only other 455 that has yet to work in April.