Ways in which to identify suspicious items would be if the stamp logo didn’t match the return to sender address

Ways in which to identify suspicious items would be if the stamp logo didn’t match the return to sender address, if there was no return to sender or the misspelling of simple words. Another thing that indicates suspicion is discoloured or uneven packaging.
If anything like this occurs, you shouldn’t open the package. The first thing you should do is report it to your manager. They will then record necessary information about it such as the time and date that it was received. If they then believe that there is more suspicion than there should be they can report it to someone higher or to the local authority if needs be who will then deal with it appropriately.