My order for 3.5g of Charls has arrived in a plastic bag with an appology printed on the from for the condition it has arrived in. I first assumed it might have been just a bit bust up but its been completed cut and torn open on the opposite side of the sticky fold with nothing inside.
The padded envelope has a pen line along it almost following the tare, but the way that the two halves of the envelope has been ripped looks like it was done tactically, simular to how its almost impossible to open a packet of crisps perfectly without any tare.
But how could they have detected there was cocaine inside, it has always come through in the past of this vendor UK>UK in a mylar bag. And why would they still send the opened letter and not a seizure note?
I once mailed a jar of tomato sauce across the country (US) and it broke during transit and the usps put it in a plastic bag and got it to its destination anyway.
I think your letter got legitimately destroyed somehow and Royal Mail just wanted to get it to its destination. We are a paranoid bunch, but letter carriers just aren't usually looking for drugs, they want to get the mail to its destination as efficiently as possible. You dodged a bullet, but I'd bet all .0000032 BTC I have in my wallet that you're fine.