Your keyhole covers are not colored plastic they are painted so please treat them with care and don't manhandle them

The covers consist of two parts. 
1. Cover 
2. Stem 

First step: 

Observe the diagram closely to figure out the orientation of the eccentric stem to the door lock and insert the cover by stabbing it downwards and pushing the stem into the keyhole, then move it around until it is flush as can be. You will notice that the cover goes only one way due to the eccentric stem. If it does not go in on the first try changing the angle until it goes in but don't be rough with it. Remember that you will not get it to be absolutely flush due to the irregular thickness around the hole and this is so you can remove them if it becomes necessary in a emergency situation. 

Second step:
The covers should fit relatively snug but it is best to remove the cover after you have them seated well and add a small bead of contact cement on the stem, Wait 10 minutes then insert them into place. The contact cement only touches the hinged door in one small area on the out side of the lock and the rest is floating on the inside and touches nothing. This will insure that no one can easily remove the cover or any chance of it falling out. I recommend this step to ensure your satisfaction. Contact Cement is a low tension adhesive which is water resistant available at any automotive or hardware store for under $2.00. Please only use this adhesive and not a stronger one. 
The adhesion method is non destructive and can be cleaned up easy with any alcohol based solvent

You will need to first push the cover down and insert your driver’s license or credit car through the gap and fish it out. the adhesive point on the lock hinge stretches and the cover is free to come out. 

Take a Q-tip doused in Alcohol and clean the adhesion point on the out side of the lock hinge which dissolves easily and replete the procedure. 

  2005-2012 Toyota newer door lock type 

Keyhole cover Instructions