I made a mistake in this suggestion that was accepted:

https://backpack.tf/suggestion/5780fac583de6b25e96dac89

4 keys were added to the trade making it 90.

https://gyazo.com/5a0a2e2fcaf777e90a1aa34b86ae6ca6

CREDITS TO "mastikhor | trade.tf" for providing the screenshot and alerting me of the mistake.

Sold for a Strange Professional Killstreak Festive Rocket Launcher (25) + DBD Magnificent Mongolian (14) + Strange Professional Killstreak Australium SMG (9.5) + Strange Professional Killstreak Australium Eyelander (37) + 4 keys pure.

25 + 14 + 9.5 + 37 + 4 = 90

(Rounding up)