Sold my 2010 Prius and have an OEM oil change door for sale. It fits 2010 through 2015 Prius Hatchbacks is in excellent/like new condition and has two hinges attached. The hinges allow the door to be easily attached in place of a missing oil change door and open and close for easier oil changes. If your oil change door fell off and you want to replace it, this is what you need. I am asking $50.00 including free shipping or $40.00 local pickup. Below are pictures of the oil change door for sale. Send me a PM if you want to buy it.
The way you did it will just allow the door to swing down, but it can't be removed. When using slip joint hinges they should be installed to allow you to completely remove the door, not just let it hang down and get in your way while changing the oil.
I purposely installed the hinges with a left and right so that the front of the door would be secure rather than removable. If the buyer wants a removable door I have an extra left and right hinge. One would simply drill out a left hinge and replace it with a right hinge to have the pins facing the same direction so the door can be removed. I can do this for the buyer if desired. However, I do not recommend this since the door swings open and can be secured flat up against the undercover which provides the same utility as removing the door and a more secure door when closed. This is the same door as pictured in post #1 of the below thread. Oil Change Door - Permanent Solution | PriusChat
If you clicked on Start a Conversation like I pointed out, entered your text in the pop up window and then hit the Start a Conversation button in blue, you did it right. Also, I removed your email from your post above. Not the best idea to go sharing that in open forums, give it to the OP via the PM aka Conversation here on Priuschat.