iPhone 4s Activation lockout

This ones got me pulling my hair out! Please help. So I found my old iPhone 4s from about 10 years ago. I wanted to give it to my daughter to play with on WiFi. I turned it on and It asked me to sign in to iCloud. This particular iCloud account was made with a generated iCloud username (name@me.com) so it technically isn’t a email. Fortunately I remembered the username and password after a few attempts. However, it said this account was disabled due to security reasons. So I had to be redirected to Appleid.com to update and verify this particular login. When I tried to login at Apple ID and iCloud it then asked me to verify myself by sending an email on file with that account. Well I deleted that 9 years ago so that was out of the question. I also had the option of answering security questions so I chose that option. Before I was brought to security questions it asked me to verify my birthdate. I entered my birthdate and it didn’t match my account.... Then I realized that at the time I made this account, I used a false birthdate and legal name because I clearly wasn’t thinking when I was 19 years old. So I contacted apple support and they told me I would have to get proof of purchase of the phone in order to prove that it isn’t stolen I’m assuming. So I called sprint... yes sprint lol. They said they no longer have records of my purchase because it has been so long and there files don’t date back that long. Pathetic if you ask me but that’s where I’m currently standing. Find my iPhone does not pull up the device because it’s deleted. No old emails. Nothing. Am I locked out of my phone forever now? Please help. If so, my daughter can suck it up. I didn’t get a phone until I was 18 and I turned out just fine haha. Thank you all in advance!!