Here is advice from this Puppy News article:
Caution: if you see any signs of worms you will need to take a sample of faeces to the veterinary surgeon. Do not handle your puppy without wearing gloves and constantly wash your hands.
I'd take the puppy, not just the sample. Puppies should be seen by a vet for basic care. Find a good vet you like and can afford and let him care for your pup.