How do I print values only when they appear more than once in a list in python

You could make the following adjustments:

c = Counter(seqList[1:])  # slice to ignore first value, Counter IS a dict already 

# Just output counts > 1
for k, v in c.items():
    if v > 1:
        print('-value {} appears multiple times ({} times)'.format(k, v))

# output
-value 1 appears multiple times (2 times)
-value 4 appears multiple times (4 times)