Buyers can't mark items as received.
if they leave feedback, and the item cost was under £25 your payment will be released.
Otherwise, you will have to wait for the tracking to catch up or 14 days after the transaction.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)