What is the status of possession if the identification marks on a firearm are deliberately altered, but the owner claims unawareness?

The claim of unawareness regarding the altered identification marks on a firearm may lead to various legal interpretations, particularly concerning possession and the law's treatment of such situations. If the owner can convincingly demonstrate that they had no knowledge of the alterations, it could indeed result in insufficient evidence to prosecute for a crime. This is due to the requirement of intent or knowledge in many criminal statutes. In many jurisdictions, possession alone does not equate to guilt, especially when it comes to proving that an individual has knowledge of the illegal condition of the item in question, such as a firearm with altered identification marks.

Therefore, in this scenario, without evidence to demonstrate a knowing violation of laws regarding firearms, it is reasonable to conclude that there isn't enough evidence to support a criminal charge, aligning with the option that suggests, due to lack of evidence of intent or knowledge about the firearm's status, no crime has occurred.