Was 5820 a typo?
Notice the 5814 pirate & 5815 knight have their swords mixed - we've discussed this before.
These were selling in Tesco for £1.50 recently, and Gordon got me several (thanks Gordon!) - since then another friend saw them going at 33p! Unfortunately he didn't buy any at the time, and they had vanished by the time of his next visit.
So these appear to be drifting back across the Atlantic slowly... maybe they didn't sell well in the US.
The mysterious 12 pc, 11 pc and 9 pc on the top of each card appears to include the leaflet as a piece.