[ettore910]

How many days will I contact them to find out the status of my investigation?

Firstly, contact them a day after the delivery and say that you're still waiting for the package to arrive.

If they decide to open an Investigation and you're given a lengthy time frame for completion, contact them after around a week asking where your claim stands.

I contacted a representative via chat on the day of delivery (yesterday), and he opened a 5-8 day investigation, do I have a chance that the DNA will work?

If not, would I be able to return it?