Hi!
Just chiming in on my experience in Japan back in November 2023.

I emailed 3 VCA SAs in Japan (2 in Osaka Shinsaibashi and 1 unsure) prior to my trip and all 3 said that the items I wanted were not in stock or they weren't able to tell me their stock until I visited the store in-person. I was looking for the sweet alhambra earrings (MOP or carnelian), vintage alhambra earrings in malachite, and the small perlee ring in rose gold.
When I was in Japan, I visited the VCA store in Kobe (Daimaru) at ~1pm on a Sunday and they didn't have any of the items I was looking for, but they did have the sweet butterfly earrings in MOP. When I visited the Osaka Shinsaibashi store the same day ~3pm, the SA originally said that they did not have any sweet alhambra earrings in stock, but they did have the malachite vintage alhambra earrings in stock. After trying on the malachite vintage earrings, I decided that the size was larger than I would have liked so I decided not to get it. After talking more to the SA, she said that she will check her stock again for the sweet alhambra earrings and she was able to find one in MOP!! She said that one pair came in that morning and I was lucky to score the item! She mentioned that she has not seen any carnelian sweet alhambra earrings at the store in the past year. The store did not have the small perlee ring in rose gold, but they did have the medium perlee ring in rose gold in stock. I would highly encourage you to visit the stores and ask in-person since their stock changes daily depending on when they get shipments.
ps- I was able to get the small perlee ring in rose gold in Taiwan (Taipei 101 store) so it worked out!