hide identity/ip from logs?

[River]

Hello,
Dont know if this is the correct section to post this matter, but i think it is.

Several days ago I received an email which contained a message if i wanted to see something (with the title),no link or attachment.
I knew this title because my friend uploaded it on our server for me to download, we have a seperate folder for it created.
Because i knew it had been on our server I went looking there, and found it again in a folder we use to share files to download for our friends.
I guess we forgot to erase it.
I contacted our hosting company and asked for the logs, which they sent me, on that log no suspicious ip-adresses where found.
The email i received was from an anonymous email site, tried to contact them too but no reply.
Because I "cruised" thru the server my ip-adress was all over the place, so my partner now suspects me from cheating/blackmailing.
The log didnt provide anything supicious to her, than that.

Since my knowledge about computers/programming etc is very poor, but i do have a suspicion on who it might have done i have a few questions and i hope someone can help me, i would like you to know also that my "suspect" is a computer-genius, he is an it-programmer etc etc..

The following questions might look if i want to try it, thats why i dont ask to tell me on HOW to do it, but I only would like to know IF thoose things which are in my mind now are possible...

1. How accurate are the server/hosting-logs?
2. Can ip-adresses somehow be copied or deleted?
3. If the person knew where we posted our files to download (we posted a folder in folder from a site we have up, but this folder was not in anyway connected to the site), and he entered by typing the correct URL and not using the ftp for that, would it display on the server log?
4. If this is the case, should it display on the site-statistics since this folder wasnt really "connected" to the site, allthough it was in the site-folder?
5. To make it short, can anyone be that smart to keep his "identity" hidden from ALL sources??

I hope someone can help me, because if i cant provide anything i am about to loose someone who is very dear to me...

[kimberlybarryd]

I'm just going on things from others. Unplug your router for 5 mins, Your Ip will change. Gmail cant be traced. "Not My facts"