I got curious if I can get data to answer that, and it seems so.

Based on xlsx from [0], we got the following ??d? localities in Poland:

1 x Bądy, 1 x Brda, 5 x Buda, 120 x Budy, 4 x Dudy, 1 x Dydy, 1 x Gady, 1 x Judy, 1 x Kady, 1 x Kadź, 1 x Łada, 1 x Lady, 4 x Lądy, 2 x Łady, 1 x Lęda, 1 x Lody, 4 x Łódź, 1 x Nida, 1 x Reda, 1 x Redy, 1 x Redz, 74 x Ruda, 8 x Rudy, 12 x Sady, 2 x Zady, 2 x Żydy

Certainly quite a lot to search for a lost package.

[0]: https://dane.gov.pl/pl/dataset/188,wykaz-urzedowych-nazw-mie...

Łódź seems to be the only one translating to ??d?, all others have normal ASCII characters in the places 1, 2 and 4

Interesting! However, assuming that ASCII characters are always rendered correctly and never as "?", it seems like the only solution for "??d?" would be one of the four Łódźs?

Experienced postal workers most probably know well that ??d? represents a municipality with three non-ascii characters.

Interestingly, Lady, Łady and Lądy will end up the same after the usual transliteration.