Mysteries down memory lane

This storyline begins when my own overkill character begins getting mysterious packages from an unknown sender and she decides to investigate it more.

Mysteries down memory lane
Overkill wakes up from her own bed to start her regular day as she normally does until she heard some scary mysterious knocks from her door and she decided to go and investigate on what's going on. Scared outta her mind, she hesitated to even open up her front door but after a while, she saw a mysterious box with a letter that said project 863. She then looked around to make sure that there was nothing else left and then she quickly closed the doors. Then she decided to carefully open up the box and she also started reading the letter and it said "hello and welcome subject 4 aka 023. I'm guessing that you found the package that I have left you. Good because you need to listen to me very carefully because what I'm about to tell you will change everything that you know about project 863 and I will contact you soon, signed unknown." Then she looked inside the box and she have found a lot of old tech devices and some random blueprints of project 863. After a few minutes of relaxing, she suddenly hears her phone going off and when she answered, the unknown caller told me that the reason why he contacted me is because he needed help with something important.