It was quicksold to a bot, but the month unsold at 17.2 keys in classies supports the drop. Other sales:

https://bot.tf/stats/item?def=341&q=5&ef=Green+Confetti&craft=1&aus=0&ks=0 ----- Untraceable sale at ~17

https://backpack.tf/profiles/76561198315588518#!/compare/1533506400/1533592800

Sale at 15 here, which was below buyers at the time apparently (around the same time the bot.tf sale at ~17 happened):

https://backpack.tf/profiles/76561198153806405#!/compare/1533772800/1533859200

https://backpack.tf/profiles/76561198087009374#!/compare/1518134400/1533859200

Buyers are now below ~14, so this should have been 15-17 in case the sale at 17 was traceable. Since it isn't, I don't mind going with 16 here (same median), so accepting.