[mothered]

postman has signed for it but my son took the parcel

Perfect DNA material.

There's no evidence to conclude that the package was personally accepted by your son, or any household member.

also provided gps data showing outside the house

Tracking/GPS Info Is a useless form of verification on a personal level.

It only concludes the package made Its way to an "address" and not to a "person". There's a big difference between the two.