Hi, I was going through my vault and found a few random items. I have had these items for awhile and it occurred to me that I don't really have any clue what they do. Can anyone tell me what they are for?

Spherical Self-Contained Capture and Storage Unit

Silver Coin

Magical Keepsake Box

I think the magical keepsake box increases your pets treasure chest size

and according to wikibeta :

Spherical Self-Contained Capture and Storage Unit - will obtain 3 random plushies

Magical Keepsake Box raises one of your pet's treasure chest by 1-3 slots, Spherical Self-Contained Capture and Storage Unit gives you three (?) random plushies, and Silver Coin can be used at the Coin Machine to give you sP, items, or stats.

Thank you! SubetaHQ isn't very helpful for working out what the items are for.