The singular form calcentin can be found in the Larousse Diccionario Basico Escolar (Larousse Basic School Dictionary). Although calcetin/calcetines is currently not available in Duolingo, this word is also accepted among spanish speakers. Just take a look at these spanish HM websites and you will see that the word calcetines is used:
That's a start. Let me see if I can make it really wacky.
You got a bunch of counterfeit brandname calculators spread out on the bed in seedy rundown roach motel somewhere in the Tropics of Cancer.
Your handler leaves you a message stating that the fence is ready. Your contact at customs is go. Now all that's left to do is sock each calculator and pack them into your luggage.
You don't have to worry about some xray machine where you're going through. The customs inspector has already been paid off. The purple socks are not to be touched. The purple socks that each have 2 calculators per sock stuffed in them.
What could be easier. Purple calculator socks. Easy peesy! Calcetines.
What could possibly go wrong?