Which specials are missing?

All the DVD specials so

• Creating their World
• At Boot Camp
• Muskets, Leather, Corsets and Swords
• Saving Constance, Their Finest Hour
• Secrets of the Musketeers (12 parts)

Creating their World
At Boot Camp
Muskets, Leather, Corsets and Swords
Saving Constance, Their Finest Hour

How long is each featurette?

Secrets of the Musketeers (12 parts)

Are they the same as the YouTube featurettes?

In order: 19, 16, 16 and 11 minutes

Secrets - no they don't appear to be. Titles are things like 'The Music of the Musketeers', 'Building the Queen's Chambers', etc. They are all around 5-6 minutes I believe.

In order: 19, 16, 16 and 11 minutes

These are probably fine. I've only seen a 2 minute long At Bootcamp on Youtube.

no they don't appear to be. Titles are things like 'The Music of the Musketeers'

The YouTube video of the same name is 5:52 minutes long: https://www.youtube.com/watch?v=Vm24ivyOAOU

Building the Queen's Chambers

This one is only 3:31 https://www.youtube.com/watch?v=9s1LCasEZRY

It looks like they might all be on youtube and referenced as external media videos. My reason for wanting them in the specials though is so they come through on Plex - can't tag anything from the 'related videos' section.

The full listing of 'Secrets of...':

• The Music of the Musketeers
• Episode 1 - The Escape
• Episode 1 - Underwater
• Episode 5 - In Action
• Building of the Queen's Chambers
• Building the Astroglobe
• Series 3 Update
• France vs Spain
• The Villains
• Strong Women
• Set Tour
• Customer Tour with Tom Burke