This is by no way a slam against your friend, but unless they came from a government store there is a 99% chance they are fake. I am off to the Habanos cigar festival on Monday in Havana. I have seen my fair share of counterfeits. Regardless if these are a good deal or not, I have seen many friends come back from Cuba with great "deals" and almost all of them are fake. Also, Montecristo does not make a #3 in a Tube. A Monte #3 is a 42 Gauge and 5.5 inches, the Tubos are 6 inches and 42 Gauge.
Here is good site with samples of counterfeits.
2003 530i Titanium Grey/Black, Premium and Cold Weather Package, Ultimate Pedals, iceLink iPod Kit, Bluetooth, M5 Deck Lid Spoiler, M5 Rear Sway Bar, M5 Dead Pedal, DINAN S1 Trans and Engine SW, BSW 12' subwoofer, Valentine V1 hardwired, SMG Paddleshift kit
2005 X5 Sterling Grey/Truffle Brown, Premium and Cold Weather Package, DICE iPod Kit, Bluetooth, DSP, Comfort seats, Invision DVD Headrests, Valentine V1 hardwired, TomTom GPS