So I contacted Konami support & I told them that I bought the large coins pack with no use for them except buying one FOB, & they emailed me back telling me that more are coming soon at a "date that is yet to be fixed".
Here's a screenshot of their email.
(I'm playing it on PS4 so I don't know why they said PS3).
Here's a screenshot of their email.
(I'm playing it on PS4 so I don't know why they said PS3).