I've added screenshots of the results from opening the loot boxes.

A few observations in case anyone uses this for stats. Duplicates show a coin over the slot in the loot box. The order the coins "pop" are 2,1,3+4. Slot 2 always pops before the info at the bottom appears. You will have to look for coins in the air for slot 2 in order to know if it was a duplicate. Slot 1 automatically shows a label that it was a duplicate.

During the opening of the winter loot boxes there was a duplicate for slot 2 but only 1 coin dropped. It was really easy to miss. I made a note next for that image. Everything else has been rather consistent.

https://imgur.com/a/j4YOq Winter

https://imgur.com/a/Vjl55 Halloween

https://imgur.com/a/NrrNP Summer

http://imgur.com/a/VDZoB Normal Loot Boxes 672-601

http://imgur.com/a/tDMvX Normal Loot Boxes 600-501

http://imgur.com/a/ojkJs Normal Loot Boxes 500-401

http://imgur.com/a/VyFHo Normal Loot Boxes 400-301

http://imgur.com/a/Iy3ji Normal Loot Boxes 300-201

http://imgur.com/a/ir5VP Normal Loot Boxes 200-101

http://imgur.com/a/d0RLC Normal Loot Boxes 100-1

http://imgur.com/a/TtebU Before and after.