The Federal Trade Commission alleges in a new court filing that attorneys for Amazon slowed down its Prime inquiry—and nearly caused investigators to miss a trove of key documents—through misdirection.

The allegations were contained in a 92-page amended complaint the FTC filed Wednesday in its 3-month-old lawsuit alleging the company intentionally made it unduly difficult for customers to cancel its $14.99-per-month Prime service, which gives customers free delivery and other perks.