I live in Beechworth if I can help in any way ( showing you around the town, taking photos etc)let me know.
You should also get in touch with Adam Wynne-Jenkins who runs Beechworth Ghost Tours at the Asylum. He was brought up at Mayday and is a walking encyclopedia on the place. Also contact The Burke Museum in Beechworth. There are still many people in town who worked there that may share some stories with you. The local paper is the Ovens and Murray Advertiser which unfortunately only has a couple of years worth on Trove but the originals are here in town.
Let me know if I can help. I'll find some numbers for you.