Nice to have since a 4xx code is supposed to indicate an error on the client's end. Tools like CloudWatch report this as an error. If a request is good but we don't have data to return, it is best to return a 204 (No Content) error code instead of a 404 (Not Found). https://httpstatuses.com/204 https://httpstatuses.com/404 Same is true for Opt-outs. Out-outs in Retrieve API as 404 is confusing. Nice to have it's own unique code as 20x or 4xx for Opt-outs. Further, a no-match with a Retrieve API due to filter_updated flag should have a different code than 404/204. Currently, there is not way to distinguish between: a) no such record in PDL system (a true no-match); b) we have a match but not with your filter flags; c) an opt-out (on retrieve) d) a real HTTP 404 error. **ADDITION on 1.26.24: We should also have: +206 code for we have a match in our system but your required parameters caused a no-match. +207 for Opted-Out