I'm new to this hobby, so I never heard of it. But I did do a quick technical check on it. Domain is registered by someone in Quebec, Canada through GoDaddy as of 2019-07-17. (so ~2 years old).
So one red flag to me is that in the About Us, it says
Shipmypinball.com LLC is an American company created to help pinball enthusiasts across North America ship and clear customs from one convenient online location.
I tried to look up Shipmypinball.com LLC for business records, but didn't find anything in a quick google search yet. I don't see a physical address to do an LLC registration lookup in a particular state either.