Most of the trucks did not come with them stock. There is provisions to cut the box and add one in you will need to see if there's one in there first.
Open the glove box and squeeze the tabs in on the sides to get it to fold out and down. The box will unclip from the dash allowing full access to the blower/filter area. Just above the blower motor mounting flange there will be a rectangle that's either not cut out yet or has a little access door that's where the filter goes.
"CMR TUNER" email@example.com 1/4 with a 7.32 1/8 custom long/short bars by "Me" Supercharged 392 on 15psi YSI-V7. Running thru an A518!