hmmm... "mint in box Predacon"... in "MISB condition", damn...
It might be gradable under the 'qualified' grading scheme, for items that have been opened and resealed but are still very 'MISB', but I guess that would be quite different from an MISB item.
I'm not entirely certain. I suggest maybe having a chat with jgon, since this is certainly his cup of tea and right up his alley.