I think the serial number for a Series 7 box is incorrect in the database.
In the database it is 4648578, which is a number less than series 6 (8648586),
hence why on reviewing the minifig boxes we jump from series 5 to series 7 then
back to series 6.
On checking my boxes, I have 1 still sealed, but labelled as series 7 (my label)
The number is 4648588, which would make sense as this puts the number higher
than a series 6 box.
United Kingdom, England
