I didn't see any that were that obvious, but it sounds like the redactions are at Amazon's request, so they probably went for anything that could conceivably be construed as private information.

E.g. lines 7 and 9 it's "checkout" or "upsell". Probably the latter. Can't be the same as the longer redacted term on line 7 - though I suppose it might be an abbreviation for it and they're protecting their internal product/codename for some lawyerly reason?

it could just be as simple as a group of persons as amazon didn't want certain words associated with them on a public government document. Lot easier to deflect accusations of overly aggressive upselling when you can just say "the report released by the government never once mentioned upselling" and just pretend that you don't need to answer the question based on that.