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Edit: I said this as a joke, but I genuinely just go the bag. It was on my third special box opening. I was honestly only really opening boxes for skill training seals.
Carasek's Bag in Normal box - 1/61 (1.6%~)
Carasek's Bag in Special box - 1/52 (1.9%~)
So by getting two Normal boxes instead of one:
Carasek's Bag in Normal box - 2/61 (3.2%~)
Carasek's Bag in Special box - 1/52 (1.9%~).
This isn't how probability works. If it were, then getting 61 bags would mean a 61/61 i.e. 100% chance of acquiring the bag*. When in truth, no number of attempts guarantees success for a random chance. The chance of at least one success with two boxes is 1 - (1 - 1/61)^2 : 121/3721 rather than 2/61. The difference is actually pretty minor, but it's worth noting.
*I know 1/61 isn't the actual rate, but the principle is the same.
Korore hit the nail on the head. You should also note that healing doesn't count for snap cast so the fastest way to train it is to use a disposable ice wand with chain casting (if you happen to have the beginner ice wand that can be repaired for one gold that'd be best).