I honestly think it was 40 and not 42 csgo keys. I only count 40 in his screenshots, and his BO was 40.

To be honest, if a sale exceeds its BO in full pure (like, if bo was 40 pure but he received 42 pure), I wouldnt cap it. The thing is, it actually never happens.

Technically, CSGO keys are worth more than tf keys, so it would have been even higher, although if a BO is paid in csgo keys, it is clear the seller values those keys equally to tf keys, so in this case I can understand the cap (given that it was actually 40 keys and not 42)

[Edit] I guess its hard to tell, because he splits the screenshot at a point where the keys are all the same ones (the red-ish ones).

Either way, I guess its fishy; bit too coincidental that he makes the screen like that judging by his buyout :P

Your first point stands firmly anyway:P