Resuggesting under Xergoyf's comments:

I would go 8 flat here. First off, the 7.5 sale isn't really traceable unless you wanna check 700+ items on the bot's side, and second it is a sale to a buy order. A conservative drop to 8 flat seems better here.

8 keys: https://backpack.tf/item/8521751792

https://backpack.tf/profiles/76561198092173139#!/compare/1627430400/1627689600

Sold to this user first it seems although history doesn't show: https://backpack.tf/profiles/76561197972510204#!/compare/1626912000/1630108800

Looks like it was dumped to bot after for ~7.5k: https://gladiator.tf/listings/6104632f11ae706a3a6a5fb2

https://backpack.tf/profiles/76561199102407070#!/compare/1627603200/1627689600

9k seems to match from Pyro but B/O at ~8k: https://gladiator.tf/listings/61059c5bf2fa9ed8b684c8bd

https://gladiator.tf/sales?item=Bubbling%20Prancer%27s%20Pride&at=2021-08-30T19:19:55.475Z

https://backpack.tf/profiles/76561199102407070#!/compare/1628294400/1628380800

https://backpack.tf/profiles/76561198280524116#!/compare/1628294400/1628380800

Taking 8k here.

Resold at 8k suggests dump doesn't invalidate that price point.