nnklem

Hello everybody. This panel shown in the picture below is quite loose on my truck. Doing some research, I think this is referred to as a hush panel for the blower motor or similar component. My question is, how does this attach exactly on the 2016 2500HD? In older models, I think it was held on by 3-4 screws and I didn't know if that was still the case. If I'm missing a screw or two (pun not intended), what size would I need to find to replace them?