[mothered]

Which company you reckon I should do?
Also I think they take pictures for proof of delivery.

Any company can be SEd, but "research" (particularly the company's terms), Is of the utmost Importance prior to moving forward with the claim. That Is, you need to know exactly what you're up against In order to formulate your method effectively.

A perfect example Is what you've just mentioned:

Also I think they take pictures for proof of delivery.

The key words are think and they.

* Think- Indecisive of how the company and/or carrier operates.
* They- no knowledge of "exactly who" the company or carrier Is to begin with.

In terms of the Item, due to Its nature, do note that the DNA method Is not your only option. You have the wrong Item received and (with a little weight substitution), boxing to consider. But unless you have a foundation to work with, you cannot proceed with any method.