I wish I actually understood what you are trying to describe.
These scams make me even more paranoid and wanting to pay by cash in person.
What is this 'pe81' website that people are saying to go to?
Look at the website in the screenshot given in post no. 12 by the original poster pe81.com/(with a bunch of letters after the /). This is the link he clicked and proceeded to enter his card details into. Fortunately the Bank of Ireland was already aware of the scam and blocked the transaction and card.
If you ignore the last part of the link and just enter pe81.com into a browser you get to a website hosted in China - it is seemingly an innocent website set up to offer private clinic services. Just the location of the website should raise alarms but why would a clinic be involved in parcel based transactions? In reality the website has presumably been setup as part of the scam. There will be webpages there that mimic the German postal service used by Louis.
There is no need to be paranoid. You just need to treat the internet and especially text messages with the same sceptical view you would have for other aspects of life. If someone calls you on the phone asking for money do you hand out your card details without being sure of their identity? If you get a letter asking for money from a source you do not recognise do you post a cheque? If someone knocks on your door and offers to sell you lucky heather or weed your drive do you give them cash for spraying water on a dandelion? Fraud is not new, just the methodology.