Enoden Umi No Mieru Tabi Set

Well, I found it on eBay and bought it as "new". It came in a box pictured above, closed with tape on the edges of the lid of the box. I'm not an expert, but what is considered "sealed"? Should the set box be completely wrapped in transparent foil? Did they do that back in 1999? Everything in the box looked new and original, but I can't be sure if anyone (the eBay seller or someone else before him) somewhat change the content of the box. Frankly, I had my suspicions about that because my railcar came with motor that was working but the wheels were not turning (that really could be the reason someone might replace the railcar, but it also can be factory error) , so I opened the motor and found out that one of the little cog wheels in the motor was slightly cracked. I replaced it, and as you can see in my videos it runs just fine now. Sadly, I had to kill my Toby in the process (Toby has the same motor) to find the correct cog wheel, but I didn't want to return the whole set because of it. That being said, it is however a fact that they made these little Enoden trains 502+552 in two different countries. Oh, and the parts of the gray platform are made separately too: the main part in Thailand in 1997, and the little ones in China in 1993.