Stop in for a cup of coffee

My junkyard score today. 100 bucks for a rust free, straight (minus one little dent I just noticed) tailgate is a score considering how long I’ve been trying to find one not beat to hell or rusted out. There’s over 100 of these gen trucks and this was the only useable tailgate out of the bunch. And it has the adventurer SE trim too which is even harder to find and I grabbed it too since my truck is an adventurer se

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Anyone know what the four factory indents on the passenger inside of the tailgate are for? Every tailgate for these trucks from that era had those in the same exact spot