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Unfortunately it's been about a decade since the last time I had anything shipped from Japan, so I don't remember which proxies I used :(

If you're looking for recs, I'd recommend trawling some of the subreddits for figurine collectors or garage kit hobbyists since they're both groups that employ proxy services quite a bit. Any type of otaku group really, lol. They'll almost certainly have some stories to share about good/bad companies.

Tenso. Service agnostic, just use the provided address.

You can use either a forwarding service where you order yourself to an address with a personal code, or a proxy buying service which does the ordering for you.

The big forwarding service would be Tenso: https://www.tenso.com/en

Proxy services include

Buyee - https://buyee.jp/ (though they don't like VPN access)

Noppin - https://noppin.com/

Japan Rabbit - https://japanrabbit.com/

amongst many others.