Sentence:  “H'm !" he said, "so, so&mdash;it is a tragedy in a prologue and three acts. I am going down this afternoon to see the curtain fall for the third time on what ... will prove a good burlesque ; but it all began dramatically enough. It was last Saturday […] that two boys, playing in the little spinney just outside Wembley Park Station, came across three large <WSD>parcels</WSD> done up in American cloth. ...” 
Meaning of the word marked with <WSD> tags:  A package wrapped for shipment.