The Sale:

Sold with 5 keys for Duped Searing Plasma Mining Light

Seller: https://backpack.tf/profiles/76561198169109536#!/compare/1548979200/1549065600

Buyer: https://backpack.tf/profiles/76561198195420449#!/compare/1548979200/1549065600

https://backpack.tf/item/6770325807

The only traceable sales I found on the Mining Light went to buy orders. Given how close this would be to the unsold if we were to use them, and how far it would be if a normal usable sale came to light, it should be fine to ignore this sale and just go with the unsold.

Sellers:

https://i.imgur.com/Oo3QvVj.png

https://backpack.tf/item/6770325807 - 31 keys, 23 days unsold.

Going with 31 flat.