I doubt you need more than a notepad app. It's what I used the last two times I had to move between countries and it was more than enough for me and customs. I simply wrote down important stuff as I put them in numbered boxes.
Spreadsheet are overkill, a note app is easy to access on your phone at all time and can be easily shared with someone.
Here's a sample of what I ended up with:
- 15 - camera stands / shoemaking tools / notepads / trophies / guitar cable / weaved basket X2 / cooler bag / curtain rings X 3 /
....
- 25 - Nespresso coffee machine, Italian coffee maker, plates & dishes, kitchen utensils.
- 26 - casserole, dishes, plates, kitchen stuff
- 27 - casserole, cups
- 28 - wedding dress, photos, various cat stuff, photo bag
Just like duke nukem forever was. Had to think hard to remember the name.