They can be picky. First, was it under 1 of the 2 scenarios that you are not to ship the imagined item Retail Ground? Second, you should have received an email saying it was rejected. I respond to it when that occurs.
Do not read so much, look about you and think of what you see there.
Richard Feynman-- letter to Ashok Arora, 4 January 1967, published in Perfectly Reasonable Deviations from the Beaten Track (2005) p. 230