I didn’t order either of mine from LA, although I am certain that they send in a plain box with no indication of what is inside. I would search their website in the FAQ section, usually this is one of the questions and they should indicate that they protect your privacy. If they don’t explicitly state it on their website and you are still worried, you could always call their number to place your order and ask them. I guess it’s better safe than sorry.
I have ordered 2 pump and cylinder sets, the first from northwestpumpworks.com in 2001 and the second a few months ago from vacutech.com. Both were shipped discreetly, although I would only recommend the latter in terms of product quality. My first pump fell apart. Hope this helps.