I once had a colli of three packages delivered from France to Germany via FedEx. The thing is, i live in a remote place and FedEx does not cover Germany like other carriers do. So these packages usually leave the senders in France in a FedEx truck but get here with something different. Sometimes UPS, who do it like clockwork in Germany, somtimes others. So of these three, only two arrived. I thought the same thing - one of them did not make it into the truck at some point and will be delivered later. This was on a Thursday. So Friday passed without a parcel and i thought it'll be there on monday. Tuesday i got nervous and tried to contact the sender. They got back to me two days later with the info that all parcels were delivered. Long story shorter, the third parcel arrived on Friday. One week and one day later. France to Germany.