It's identity theft at it's finest, but it seems they were sent to the address of the card owner and not sent internationally like I-*ahem* ..er. Well someone made a mistake.
I think I recognize the saying in the title. It's related to: "It's always a rainy day when you forget to bring an umbrella." Basically, the worst stuff always happens when you fail to plan ahead.
COD!So you buy all this when we're so short on money...Whaaat, again!?Black Cat Delivery!There goes our food budget for the month!It's the post office! You have a parcel!Coming...!COD parcel!It All Comes When You Least Expect ItPossibly an equivalent to "When it rains, it pours," but I can't absolutely confirm it.Sagawa Express! You have a package!COD!Mameshiki Figuresfigma Hakurei ReimuFlandre ScarletWait, what!? Did I order all this stuff!?