Note that if you received this email " Your package is available for pickup" do not download or open any attachment as this is a virus!
The email looks like this with a downloadable attachment:
Your package has been returned to the Parcelforce office.
Reason: Error in delivery address.
Please find the attached document containing detailed information about delivery failure.
Read all information carefully and come to the "Parcelforce Service" office to receive your package.
Thank you for using our delivery company.
What Parcelforce usually do when you got a package and you are not around to receive it, is that they leave a card on your mailbox that has all the information on how to collect your package.