Best judgment goes a long way.
When I have multi-item Cars orders, it's easy. They're all DIECAST TOY CARS and MADE in CHINA so I add them together as one line with value and weight combined. Add free gift, maybe a pack of stickers or Matchbox diecast which gets its own line because it was made in Thailand.
If I were to have LEGO minifigures and diecast cars together in one order, I would use two lines. Despite therm both being made in China. Maybe a person could get away with TOYS but I don't want to take a chance.
LEGO plus Diecasts plus Paw Patrol = three lines because all three might be made in China but they are different sorts of toys. But if books were added to that order, I might make Books a line and Toys a second line and mush the toys together.
But no, if someone buys five diecast Cars, I don't list each one separately if they're all manufactured in the same place.
Country of origin matters regardless of whether an item is old, new or used. I assume this is due to embargoes. If the USA doesn't allow imports of things made from CUBA, they don't allow imports from Cuba, regardless of age of item. HOWEVER! This is my opinion and/or Wild Butt Guess. I don't know for certain. I am assuming. Someone could come along in two minutes and prove me incorrect with that. I would not argue.
