[mothered]

Given It's the wrong Item received, they "may" do an Internal Investigation within the confines of the company Itself- such as (where applicable) refer to CCTV footage, check who picked & packed the order and so forth. It won't Involve anything on your end.

As for an affidavit, It's not possible to be conclusive. If It were a high value Item, then there's every possibility that It will be requested.