I know there's a few here of these topics here already but none of them answer my question, soooooo...

Do they expire, or can I wait until a later date to open them? (or until I can make up my mind. >_< )

EDIT: Ping me if you reply.

They do not expire. Just lock it or shove it in your vault until you're ready to use it.

All right, I already locked it. Thanks!