>>5318809Not terribly hard, since they are usually packaged with another figure and thus easier to feel out.
I actually got one on my first pull...
Here they list the package codes they've figured out so far:
http://www.spartanbloks.com/forums/showthread.php/series-charlie-codes-8858/index.html?s=41a23a6d533f8073baa968a370b1927b&s=bb5338fac929a13cc6ebd8c4144c34c5&
Series 15
ARCTIC PILOT.-A17015ES
GOLD GRUNT.-A15015ES
GREEN GRANADER.-A12015ES
CYAN WARRIOR.-A19015ES
RED STORM ELITE.-A16015ES
STEEL ORBITAL.-A14015ES
ORANGE FRED.-A13015ES
TRANS BROWN.-A23015ES
TRANS GREEN.-A22015ES
JACKAL L.-A20015ES
JACKAL R.-A21015ES
Series 35
ARCTIC PILOT.-A07035ES
GOLD GRUNT.-A30035ES
GREEN GRANADER.-A26035ES
CYAN WARRIOR.-A09035ES
RED STORM ELITE.-A31035ES-A06035ES
STEEL ORBITAL.-A28035ES-A04035ES
ORANGE FRED.-A27035ES
TRANS BROWN.
TRANS GREEN.-A26035ES
JACKAL L.
JACKAL R.
Series 45
ARCTIC PILOT.A01045ES-A10045ES
GOLD GRUNT.-A08045ES
GREEN GRANADER.-A04045ES
CYAN WARRIOR.-A02045ES-A11045ES
RED STORM ELITE.-A09045ES
STEEL ORBITAL.-A07045ES
ORANGE FRED.-A27045ES
TRANS BROWN.-A16045ES-A08045ES
TRANS GREEN.-A15045ES-A07045ES
JACKAL L.-A03045ES
JACKAL R.-A06045ES
Series 55
ARCTIC PILOT.-A08055ES
GOLD GRUNT.-A06055ES
GREEN GRANADER.-A02055ES
CYAN WARRIOR.-A09055ES
RED STORM ELITE.-A07055ES
STEEL ORBITAL.-A05055ES
ORANGE FRED.-A04055ES
TRANS BROWN.-A14055ES
TRANS GREEN.-A13055ES
JACKAL L.-A11055ES
JACKAL R.-A12055ES
Series 65
ARCTIC PILOT.-A06065ES
GOLD GRUNT.-A04065ES
GREEN GRANADER.-A01065ES
CYAN WARRIOR.-08065ES
RED STORM ELITE.-A05065ES
STEEL ORBITAL.A03065ES
ORANGE FRED.-A02065ES
TRANS BROWN.-A12065ES
TRANS GREEN.-A11065ES
JACKAL L.-A09065ES
JACKAL R.-A10065ES-A01965ES
Series 75
ARCTIC PILOT.-A07075ES
GOLD GRUNT.-A04075ES
GREEN GRANADER.-
CYAN WARRIOR.-
RED STORM ELITE.-A06075ES
STEEL ORBITAL.-A03075ES
ORANGE FRED.-A02075ES
TRANS BROWN.-A13075ES
TRANS GREEN.-A11075ES
Series 85
TRANS BROWN.-A13085ES
TRANS GREEN.- A12085ES