Please correct this

0Hi,02br
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01b00Note: the writing below is a grammatical exercise and does not represent an actual account. 02b02br
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00Suspect Detail:02br
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00A: Hi, I am an investigator assigned to this case, and I want to ask you a question. Are you available to answer?02br
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00B: Sure, I am not busy at the moment, and I believe my employer does want me to spend time with you answering questions. 02br
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00A: Thank you for your understanding. Please answer as best as you can with much detail, please.02br
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00A. Can you tell me something in detail about the person you saw the night of the crime and what you were doing there (at???) that time?02br
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00B. Well, I was in a back room behind our main office. tidying up the back room space when I heard a noise, like opening a door. Since I knew I should be the only one left in the facility and no one is supposed to be coming into our premises at this late hour, I was rather apprehensive: quietly, I went to the partially opened door to look and found a rather muscular guy in his twenties coming in after opening the main door of our main office. The lights weren't on and the inside was dark, but I could tell he was wearing a beige shirt and black shorts. He wasn't wearing socks but was wearing those cheap rubber beach sandals that you can easily find at any beach front stores. He had short wavy hair. 01i00Color of his hair?02i00 01i00I couldn't tell the color02i00. I was afraid and had my back room door closed as much as I can, leaving it open just enough to see what he was doing. He spent about 5 minutes looking in some drawers of desks. He seemed to have found an big brown envelope and put that in his sleeve and walked away. He wasn't rummaging through anything extensivelyt but seemed to know what and where to look. It just took only about 5 minutes for him to come in and go out with that brown envelope.02br
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00A: Thank you. If you have any more information that might prove to be useful to us. please give us a call as soon as possible.02br
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00B: OK, I will. 0-