Sale for the Coldfront was supposed to have a pure key in it as well as the carapace and supplementary ref, but I'm an idiot and missed/forgot about it in the trade. Other dude blocked me after I pestered him to add the key after, which is fair enough I guess, I'm not petty enough to make a fuss about it, it's my mistake in the first place. Should use that to price the translator, that would be giving the dude who bought it from me an extra key on top of the one he didn't add. I'm a good sport if a sore loser but it's relevant information regardless. Can't prove it either but I can at least prove he had the key to add on the day we made the trade (https://backpack.tf/profiles/76561198170878742?time=1544659200)

I could prove it with the chat log but as far as I know I'm not aware of any way to see the backlog of someone who is not longer on your friendslist. I was super pushy about the key so I guess he blocked me so I can't add him back to get the log either.