Double-question here

1. Is there anywhere on the site that displays your restock count stat other than the Restock Royalty trophy? (I was buying a few different shop items to find out if there's a delay to the trophy's counter and there seems to be, so I can't get a to-the-minute counter of my stock history it seems.)

2. Does the Mystery Box count towards the restock royalty count? (I was trying to answer this question for myself when I ran into the counter delay lol)

I'm not sure about your second question, but for your first question Restocking Royalty is still on the old high score system so it's a bit more difficult to find.

You can view a list of all of your current high scores that are on the old high score system on this page:

https://subeta.net/games/scores.php?id=USERID

Replace the part that says "USERID" with your own ID number.