how to see an original 'unedited' post

[rennieonline]

I am a member of a national organisation that recently held a competition to boost membership. I checked their site on the weekend to see who won and they had posted an announcement of the winner - 8 days before it was due to close. When I went back a few days later they have updated the post and made it look like it was only posted 4 days ago - instead of 45 days ago. I would like to know if there is anyway to prove what they have done - I have emailed them asking they admit their mistake publicly and they are denying it (this is a massive organisation and a $4000 AUD prize)

[RicheemxX]

Outside of checking Google Cached pages for that particular page there is no way you can view older/edited versions of pages. Not for a standard member anyways, a site admin might be able to get the archives assuming the site is backed up frequently.