[c0ncrete]

you're wanting to use something more like this, where @findThese is a list of itemIDs you are looking for and @lookIn is a lost of slotIDs you want to look in.

foreach my $findThis (@findThese) {
    foreach my $slotID (@lookIn) {
        if ($client->GetItemIDAt($slotID) == $findThis) {
            $client->DeleteItemInInventory($slotID);
        }
    }
}

but then you probably also want to be aware of items in a stack as well.