Beginner Seal Key

There's a 3000 yen pack in the current Florence event that comes with 300 Beginner Seal Keys. I have a ton of leftover Beginner Seal Boxes, so is buying this worth it? People say Beginner Seal Boxes are a bust because they don't give Rune Tickets, but what about Unidentified Runes? If we consider Unidentified Rune Level 1 as 1 point, Level 2 as 2 points, and Level 3 as 4 points, the expected value is 0.48 per box. So, you get 0.48 Level 1 Runes per box. This means 300 keys get you 144 Level 1 Runes (and 15 Boss Tickets). 144 Level 1 Runes = 9 Level 5 Runes. 36 Level 5 Runes = 9 Level 7 Runes. So for 3000 yen, you get 9 Level 5 Runes, 30 Gold Shards, and 15 Boss Tickets. For 12000 yen, you get 9 Level 7 Runes, 120 Gold Shards, and 60 Boss Tickets. Yeah, not worth it... Definitely a bust pack.