A..

.....  C  .....

Box B

Box C.

I say 'C'

Box A says me.

Box B

Box A

Gotta be 'B'

A= A-mutant A-Cyberdogs

C= Cyberdogs (nonmutant)

So the answer is box B 

B   

must be C

box B

center b

Let the Mutants out of box A so we can kill them all!!!!!!

BOX C !!!!!

Hmmmm. Will go with Container C

It's gotta be box A!

box B because its in the center

Without more information each box has an equal probability to contain a mutant.  I say box A based on the wording.  "A Mutant"

More importantly do we get a refund since our shipment of cyberdogs is missing.  I just don't want to see our cyberdogs being sold on Ebay2095.