I received a small manilla envelope that was empty sent by evri no info on tracking other than my delivery address,. ,i checked my  orders and nothing is missing,it was delivered by evri and had ebay simple delivery on ,with my address, and a barcode ,date and reference 1 ,(meant nothing to me)

i scanned the bar code on the envelope and

and an address in london showed , 

why would someone send an empty envelope.....very puzzled.any ideas ?