I need some advice. (again)

I am aging my cabernet sauvignon in glass carboys.

I would like to add oak to the process. My (not very well thought
out) plan is to toss a handfull of oak cubes (.5in cubes) into the
carboy itself. let them float free. I would keep them in there for
2-3 months

I know its good practice to boil corks prior to using, so, before i
add the cubes, should i boil them to kill off any bad critters?

-Wayne