5:1 code?

[Ace Groover]

Hi Folks,
Can anybody help with this one?
I'm being blamed for the loss of important texts and e-mails which mysteriously got deleted from my BB 8800 (all msgs prior to the 5th July 2010) - I know it wasn't anything I did - a few days later I noticed that when I tried the paste function in the menu, instead of some contact details being entered in the field, it entered the date that the messages were deleted up until, followed by a code - i.e. 5th July 2010 5:1

Is anyone able to explain what the 5:1 might mean? Is that evidence of remote deletion activity?
Thanks for your help
AG