For PayPal trades, it's better to use the price Keys were selling for at the time rather than an agreed upon price.

Here are some trades from around the date of the sale

https://forums.backpack.tf/topic/77120-buying-tf2-keys-for-181-usd-usa-paypal-only/ - Bought some for $1.81

https://backpack.tf/trust/76561198309612194 - Shirakami's +trust confirms the purchase

https://forums.backpack.tf/topic/77127-closed/ - Sold some for ~$1.85

https://imgur.com/a/c7TpL3o - Proof the price was ~$1.85 at the time

https://backpack.tf/trust/76561198350704417?page=2& - A few +trusts at the time confirm sales

https://forums.backpack.tf/topic/77090-buying-keys-183-with-paypal/ - Bought some for $1.83

https://backpack.tf/trust/76561198065283212?page=3& - A few +trusts at the time confirm sales

1.81 - 1.85 works as a Key price, which would make this sale 383 Keys.

Not worth forcing a resuggestion for 17 Keys after this has been up for a month, but keep that in mind for future suggestions.