The only mailbox I have today in my Nook's shop is the yellow mailbox, sorry.
I can visit now!Certainly, SugoiPurin! Let me know when you're ready to visit, but please respond as soon as possible, the shops will close in less than half an hour.
Sorry, but you can't transfer bugs between players. If you want to win the Bug-Off in your own town, I recommend going to a Club Tortimer island that's at nighttime and catching one of the palm tree beetles. If you'd like to get lots of special bug furniture, you can catch many of these rare beetles and turn them in to Nat in my town, which will enable you to always break the first place record (since it doesn't change it in someone else's town) and get a prize every time.