I had new cement poured everywhere and new steps constructed. When they cut out the old steps they discsovered the previous owners poured right into the concrete block of this part of the house (which was an addition). As a result, the concrete masons pulled out a couple pieces of the foundation block (not full block- just some pieces of it). When I asked how they wanted to fix it, they said they would cut a large piece of plywood and cover it before pouring the new steps to seal it up. The problem is that when they finished I noticed that piece of plywood was sticking out from the steps so they cut it off and then left. I got home from work and found that when they cut it off, it left a hole in which I could actuallyl pull out insulation (see pic). My friend (who is a handyman) came over and we filled the open space with concrete (the concrete company I used never returned my call). Was this an acceptable fix? Will mice be able to get into the house by burrowing under concrete steps to that piece of plywood that they poured against?