You say “Required material is either 3-5 tours....” ...... But we talk about DELIVERY missions. It has already been explained to you.
I just made this video so you can see for yourself:
Source: https://youtu.be/Ar49_Twtsmc
And I can do this over and over untill I get bored. I only very rarely don’t get my Cutter full with good missions.
You need an Extraction system in Boom state to do this, and they aren’t rare. It’s also best if the particular station has Extraction economy. And of course you need to be in good standing with the factions to get good missions, but when you are an experienced player you’ll have many systems to choose from with all kinds of economies and so on, like I do. You’ll also want stations with large landing pads (pick up + destination ) off course to be most efficient.
And you can’t check for good missions on the mission board, if you are not in good standing with the factions. I am sure you know that. They won’t show up under ‘Requirements not met”. Only one or two every then and now will.
I was only lucky with one thing here. All but one missions in the first part of the video went to Stargazer station. I’ll usually have to deliver to 3 or 4 stations when the Cutter is full.