Finding the missing Forum IDs

If you sort the ID numbers, there are a few gaps. Someone try to find them out by using archiving or contacting Scratch Team, as they all lead to 403.

50-53 Forum ID also exists, but lead to 403. All others lead to 404.
LeftoftheHeader.gif ♠BF10 talkcontributions 14:38, 1 December 2016 (UTC)

There are some forums that were deleted or only created for test purposes, so I doubt they would have a record of those. The rest are either ones like the dustbin or moderator forum or ones they probably wouldn't want to share with us.
jvvg (talk | contribs) 17:33, 1 December 2016 (UTC)
As of now, only forum IDs 12, 35, 38, 40-47, 50-51, and 53 lead to 403. 52 is now the Scratch Day forum. I believe, as per jvvg's reply, that the 403 sections are the dustbin, moderator, or ST forums, or other forums that should be inaccessible to the general public.
Kenny2scratch logo.jpg kenny2scratch  Talk  Contribs  Directory 
02:43, 28 May 2017 (UTC)

meaning

could someone add why the forums have id's?
JonathanSchaffer (talk | contribs) 03:40, 7 March 2017 (UTC)