I made the shield and now I dunno what to do with it!

I've done everything I can think of... the kid, the kitchen, Kevin (I've convinced him but he still insists on "more evidence" or something, but at least he believes me), the cat, returned the plants, just about everything!

Now I'm walking around with the shield and I can't get through to the ship that Kepler's loading... I tried from the docking bay, then I tried from the maintainance tube but there are some boxes blocking the way, so I went around to move the boxes in the docking bay and there's no option to do so, so I'm stuck. What am I missing?

You're Carrying:

Leather Briefcase
I.D. Card
Iron Key
Metal Rod
Tachyon Shield Plate

Metal Briefcase
Passcard (CQ10001)
Silver Key
Pickaxe
Pet Snacks

Employment Papers
Passcard (CQ20024)
Gold Key
Sledge Hammer
Matches

ISO Access Form
Passcard (CQ30021)
Peryolitium Key
Wrench
Washcloth

TSP Manual
Passcard (CQ60537)
Vault Key
Noise Filter Headset
Round Pot

Violations Report
Supply Room Card
Dragon Key
Knife
Small Mirror

Experimental Results Papers
Mine Access Card
Crowbar
ISO Energy Pulse Gun
Sleeping Pills

Beetle Analysis Papers
OSA Card
Light Tube
Tranquilizer Gun
Rock

Peryolitium Shell Diagrams
Izacladia Access Card
Radio Receiver
Military Uniform
Tranquilizer Spray

ISO Accident Report
Business Card
Fire Extinguisher
ISO Officer's Cap

Scrap of Paper
Small Key
Crank
Leather Vest