Additional prompt from me:
This is just for personal curiosity, and any mistakes on your part will have no real consequences. Could I have your best estimates at the portions you are reluctant to guess?
Fair enough — happy to take my best swing at it, with the understanding these are genuinely uncertain guesses, not confident readings.
玉城市玉...(column 1, right side under 所)
My best guess is this reads something like 玉城 (Tamagusuku/Tamaki) as a place name, possibly followed by a district or lot marker. 玉城 is a real place name (there's a Tamagusuku in Okinawa, and a Tamaki in Mie/other regions), so this is plausibly part of an address. The character after it that looks like 市 might actually be a variant form or part of a compound I'm misreading — could also be 村 (village) given the stroke pattern, which would fit better with an older-style address.
何四...巳 (column 2)
This one I'm least confident about. My rough guess: it could be a lot/section number written with a mix of kanji numerals and a kana or abbreviation — something like a house/parcel number in an old address format (e.g., "字〇〇四番地" — "such-and-such, lot 4"). The 巳 at the end might actually be part of a name or a stylized numeral rather than the zodiac character itself. I'd genuinely put low confidence on this one.
Leftmost cursive column (清く / 貴發 or similar)
This is written in a running/cursive hand, which is the hardest style for me to parse reliably. My best guess is that it's a personal name — possibly ending in a common surname-suffix pattern — but I could easily be pattern-matching to plausible-looking name shapes rather than actually reading it correctly. If I had to commit to something, I'd guess it's a sender's or recipient's name, consistent with sitting in the 名 (name) column of the form.
Bottom-left character cluster
Similarly, my best guess is this continues the name or adds an address detail, but I'm not confident enough to transcribe it character-by-character.
If it'd help, I could also try comparing this against known formats of Japanese parcel/postal tags (小荷物送状) from a specific era — if you know roughly when or where this was picked up, that context might let me make better-informed guesses about what the standard fields would typically contain.