Can anyone help with a trade value question please?

Why not, all same value on average, all from the same bundle.

Key can also be bought for 1.60 euro on gamivo including fees.

Ok, thanks. Maybe I'll take a chance on asking at ST. Worst they can do is laugh at it.

Unrailed is worth the most

Just check how valuable these games are on key reselling sites and you get an idea which trades are possible.

I'd offer you to take Them's Fighin' Herds as one of my selections and trade, as I'm absolutely not interested in it, but I'd have to make all my selections then and I wanted to do that somewhen later.

Like Rexlux said, Unrailed seems to be the most popular from these three :)
And "Them's Fightin' Herds" is not so popular, so it should be no problem to make a 1-1 trade.
And I would recommend barter instead of ST, but that's your decision :)

G2A is only good for one thing, to see the underground trade prices of games if you want to sell them. Kinguin is sadly unreliable, their price fluctuate a lot. And CDkeys is just a mess.

Alright, Thanks for the input, I might wait until the next choices and try to trade.

Going to close this now.