After you get the scooter, charge it, and chase the cart into the fountain, head back to PrintFax and click on the first copy machine. Press "menu" and select the last scan.
You don't need a key. When the dummy crashes the cart into the fountain, travel to PrintFax and look at the first copier. The MENU will bring up the last copy that was scanned.
You get the key for Good Deals when you surprise the robber at MacGuffin's. (He knocks you down at the Costume store.)
There is no key to MacGuffin's or its back room. The key that you do recover fits the back room at Good Deals next door.
You do not get that key during the quest. The key that is eventually dropped in MacGuffin's fits the back room at Good Deals next door.
The "Back Door" key fits the employees-only door at Good Deals Electronics. (use the toy robot by the camera to keep the lights on)
The Employees Only room in Good Deals. You can use the toy robot by the camera to keep the lights on.
It doesn't fit the door at MacGuffin's. Try next door at Good Deals. You can use the toy robot to keep the lights on.
The thief drops the key in MacGuffin's but it doesn't fit the back door there. Go next door to Good Deals and try that door. You will need to use the toy robot to keep the lights on.
After you surprise the crook in MacGuffin's he drops a key. It doesn't fit the room at MacGuffin's but it does fit the back room at Good Deals next door. *Put the toy robot next to the camera to keep the lights on.
The one at Good Deal Electronics, just next door to MacGuffin's where you surprised the robber. Use the toy robot by the camera to keep the lights on.
After he knocks you down in the Carnival Costumes store, go to MacGuffin's and hide there. When he enters, you can surprise him. He gets away, but drops a key marked 'back room.'
Once you have the key that says "back room" you only have to go next door to Good Deals, and use the toy robot by the camera to keep the lights on.