Have the last two people paid yet?
And have you been messaging them?
It's not even about forfeiting items anymore, since the lowball has been well over a week now.
It's getting close to that time where if they don't get back to you, you can probably contact a mod about it, and then leave negative feedback if there is still no payment received by the 2 week mark.
Unless they specifically told you they couldn't pay until then, that's different.