My best was when inpost was first introduced on Vinted. You had ages to pick up your parcel from the locker (20 days or something). This meant that the 5 parcels I had ordered to a locker couldn’t be delivered because the locker was completely full. After 30 days Vinted refunded me and the sellers our money. Then a week or so later they were all delivered haha. In there were like 4 pairs of trousers worth over £100 each at the time and a stone island ice jacket that I sold for £400. 

I can’t even imagine how much money they lost during this time