If I ditch a postcard can I replace it later?

[Bonaventure]

They're clogging up my ship and I'm gathering they won't be useful for a while. If there's no way to store them compactly, I'd love to just leave 'em on Nowhere V and get duplicates if I want them.

[Captain Steve]

I think you can get more if you want, but I've left items in delivery sites on planets and forgot about them only to come back hours later and find them still there. It could do the same for postcards.