Challenge 19, Team F.L.A.M.B.E.S!

50th suggestion, made by Mikey!

Marketplace Sales:

https://marketplace.tf/items/tf2/1108;5;u3015

1:

https://backpack.tf/item/4964869279

May 7th - $20.42

Keys were $1.88, so 20.42 / 1.88 = 10.86 keys, rounding to 11.

https://bot.tf/stats/listings/4O9LN6DJ

B/O of 12 keys

2:

https://backpack.tf/item/2756395479

May 26th - $19.42

Keys were $1.93, so 19.42 / 1.93 = 10.06 keys, rounding to 10.

3:

Can't find item history.

May 28th - $19.42

Keys were $1.91, so 19.42 / 1.91 = 10.17 keys, rounding to 10.

No other sales. 1 Unsold on classifieds @ 12 keys for 7 months.

2 Sales at 10 keys

1 Sale at 11 keys

Taking 10-11 keys.