2 exist

1 on classies ~ month @ 60 as of today = https://imgur.com/a/wtQXz - https://backpack.tf/item/5759916998

1 on scm - https://imgur.com/a/sGEr6 - Keys @ $3.10 cdn = ~54 keys but unknown how long it's been on there so not using but definitely supports the drop

The only recent 'sale' looks untrackable - https://backpack.tf/profiles/76561198179587659#!/compare/1506902400/1508457600 maybe cash or scm

Before that the sale is over 2 months old - https://backpack.tf/profiles/76561198179587659#!/compare/1504569600/1504656000 used in last suggest

B/O drop is all that can be accomplished here