Big 5 has the most relaxed return policy.
http://www.big5sportinggoods.com/con...ns-policy.html
Original Purchaser of Firearms:
*Firearm purchases must be returned to the same store at which they were purchased.
*No refunds or exchanges unless returned in the original condition within thirty (30) days from the date of release.
I personally have known someone that has returned a firearm at Big 5.
My guess is someone bought it, shot it, cleaned it, and returned it.