Back in the 1980's, was not very computerized like today, brokers did not keep manual eyes on their clients. I kept a corn contract too long and broker called and said I be needing to pick up 5,000 bushels of corn, WTF? That little mistake cost me $4500 of getting someone else to buy it, so new buyer pretty much bought it for 20% than normal. I would have not minded actually of receiving, but it is not like UPS coming to front door, it is you going to Chicago, locating it, having enough semi's to haul it away, then storage and then selling it.
No, it was another dumb mistake and pile is quite large of all the dumb mistakes I have done in this business, but stay with anything long enough, you really figure how the game is played.