Deck Air vents installed on roof how do I know if the blown attic insulation is blocking them or not?

We had a new roof installed with deck air vents on all four sides of the house. The vents are difficult to see from inside of the attic. We had insulation blown in the attic before they replaced the roof and installed the vents. Because they are hard to see and on two sides, we have a vaulted ceiling, it's almost impossible to crawl down and see the openings. My biggest concern is if the some of the blown in insulation is covering the openings or if it's something I don't need to worry about