Poirot fans, who wish to have a complete collection, will find navigating through all the sets offered somewhat of a maze, specifically due to the lack of episode/movie titles, on the box front or in the seller's description. Some diligent viewers have been kind enough to provide titles, in their reviews. However, I found it particularly difficult, when shopping, to figure out the contents of The Classic Collection Set 3, which is in a silver box.
Here are the titles:
1. The Adventure of The Egyptian Tomb
2. The Underdog
3. Yellow Iris
4. The Case of The Missing Will
5. The Adventure of The Italian Nobleman
6. The Chocolate Box
7. Dead Man's Mirror
8. Jewel Robbery At The Grand Metropolitan
9. The Case Of The Clapham Cook
Purchasing The Classic Collection Set 1(orange box), Set 2(yellow box), Set 3(silver Box - this set), and Set 4(platinum/pale pink box), individually is the best bargain. The Classic Collection Sets 1, 2, 3, and 4, completely cover all of the Agatha Christie's Poirot: Collector Sets 1 through 12, a total of 36 episodes, which are the boxes with different colored bands, on the left side. Each of the Classic Collections has 9, of those Collector Set episodes.
For example, this Classic Collection 3, covers the Collector Sets 7, 8, and 9. Later The Classic Collection, Vol. 2 was produced, which covers nine movie length features, originally produced by Grenada Films and are different movies, from the 36 episodes, offered in the four Classic Collections. See the very professional review, on The Classic Collection, Vol.2, by Themis Athena. It is confusing, because the titles, of each collection, have only subtle differences. Now the more recent films, which are new stories, are being marketed under Agatha Christie's Poirot: The Movie Collection Set 1, Set 2, Set 3, Set 4, Set 5, and Set 6. Each of those sets has a different colored band across the top, of the box. The first three, of The Movie Collection Sets, is offered in Agatha Christie's Poirot: The Definitive Collection, which is the most economical purchase. The Movie Collection Sets 4, 5, and 6, are only offered individually.
Hopeully, the above information will help you, with your Poirot movie selections.