Help Needed: Unlocked Apple Computer

My computer is stuck in activation mode and I appear to have lost the Apple ID and password. I need an expert who can help me unlock the device, assess whether it's previously owned and figure out if I have any purchase proof.

Ideal skills and experience:
- Proficient with Apple products
- Experience with computer unlocking
- Good at troubleshooting
- Able to assess previous ownership
- Patient and understanding
- Excellent communication skills