Here's my ghetto recommendation since it has no removable faceplate:
1. Find a photo of, or carefully take a picture of (taken in even lighting; you don't want glare spots to occur and ruin the picture), of either an OEM radio that is intended for a Toyota or a cheap radio that's believable (e.g. Jensen, Dual, etc. mediocre radio; don't go for the AutoZone AM/FM only radio

), preferably ones intended for a double DIN. If your printout doesn't look 100%, don't worry about it; the average thief will only spend 3-4 seconds shining a light into the car, and the actual theft work shall not ideally go past 3 minutes.
2, Print the picture of the radio on matte photo paper (matte = not glossy). If your replica is a single DIN, be sure to add a black section below it, and out the graphic to fit over the radio. If there are any protruding knobs on your radio, retract it if you can (I have no idea if yours does or not). If not, lightly Photoshop your mark radio to match the location of the real radio (you don't want the knob to protrude out of the mark's radio's preset button row, do you?), then craft a knob cover to protude outwards and cover the knob.
If you need to cut out
3a. If there's enough gaps around the edges of the radio, create tabs that can fit into the gaps as well, but make sure that they're black as well to blend in.
3b. If tabs are either impractical or can't be done,
Make sure that either the back side of the photo is laminated or put clear tape where you intend to tape it; this reduces the chances of the photo ripping if you need a new layer of tape.
4. Get some double-sided tape that has a weak bond (think Post-It weak) or roll up some masking tape... Or you don't, dab it a few times on some clothes until there's enough lint to lose the bond; if the bond is too sticky then it gets hard to remove and/or will leave a residue.
5. Like other members said, don't bump your system in conspicuous places, and put your cover over it when you're not in the car..