It does not worth.
195 boxes (13 "promos"):
1 Brooch Spirit Stone Rare-Type
1 Rare Book of Splendor
1 Rune Stone
2 Superior Giant's Codex Chapter 1
3 Dye Crystal
3 Nevit's Gold Hourglass
4 Artifact Crystal
4 Artifact Fragment
4 Dark Armor Enhancement Stone
4 Freya's Bloody Rune (2 hours) Box
4 Low-Grade Forbidden Secret Book
7 Top-grade Spirit Stone
9 Bloody Armor Enhancement Stone
11 Superior Giant's Codex - Mastery
23 Honey Dark Beer
25 Maphr's Luck Potion
29 Elcyum Crystal
30 Brillant Freya's Scroll of Storm
30 Glowing Dragon's Attribute Potion EXP
975 Shiny Gold Bar
If I use the "possible" item in the page (https://www.lineage2.com/news/unlock-the-suspicious-safe) as the prob order, My best item was the number #29 in the 48 items list,
I hope you will have better luck.