Regarding Sale 2 - I was the one trading away the Shotgun, I believe the sale is seemingly untraceable due to the unusual it was traded for, (A Starstorm Slumber Virtual Reality Headset), was taken off of MP.TF to make the trade.

https://backpack.tf/profiles/76561198032176942#!/compare/1526083200/1526169600 - Sale of shotgun + Roughly 15 keys in adds.

https://backpack.tf/item/5192410624 - The history of the Headset itself as evidence for it, due to it not appearing in the previous link.

https://backpack.tf/profiles/76561197980103022#!/compare/1527379200/1527465600 - And if necessary, the Headset's sale. Was a 3:1 with the Steaming Hot Air, FOD Fanfare, and Virtual Reality Headset for the Chill Chullo.

I apologise if I've presented the information incorrectly or if it in general just isn't helpful, suggestions are rather foreign to me. But I recognised the shotgun, and thought my input could be of use, and this is all the backup I can provide.