When you first purchase a card for your Pack, it is safe from being stolen for only 15 minutes, unless purchased with tickets. In order to prevent it from being stolen from your Pack after this temporary lock wears off, you can either buy and place a lock on the card, or you can move it to the Vault, where it is permanently frozen and cannot be removed.
You can move a card to the Vault one of two ways:
1.) You have 5 (or more) cards that are the same color
2.) You have 5 (or more) of the same card
1.) From your Pack, click on the Vault icon in the top right corner of the screen:
2.) You will see this dialogue box:
3.) Then, click on 5 (or more) cards that have the same color. The game will automatically grey out the cards that can’t be vaulted. Then click the Vault button. These 5 cards do NOT need to be part of the same collection, they just need the same color background. Note that in the example below, 3 cards are from one collection, 1 is from a different collection, and the last one is from another different collection. Because they all have the same family color, they can all be vaulted together.
In the example above, note that only banana-colored cards can be selected to Vault; if the player had clicked on a cherry-colored card instead, only cherry-colored cards would be available to Vault.
4.) A dialogue box will pop up that shows what collections the Vaulted cards each belong to, as well as your progress in those collections:
5.) The second way to Vault a particular card into your collection is to Vault it along with at least 4 other identical cards. From your pack, click on the Vault icon again, and then on a card you have at least 5 copies of:
A dialogue box will pop up showing you what cards you have vaulted. In this case, all 5 cards only count toward one spot in the collection; you can have as many copies of a particular card Vaulted as you wish.
Now when you go to your Vault and select the collection you were working on, you can see which cards you still need. Note that the number on the top right corner of the card shows how many of that particular card is in the Vault.