If i send the latest fk3 file to my openbox will it remove my sharing caids that i have entered? I have spent alot of time entering new caids and providers into my sharing menu and dont want to lose them when i update my keys

Yes, your entered CAID's will be replaced with those that exist in the certain .f3k you upload to your receiver. However, if you grab the file from here, the most used CAID's are already written.