A second batch of same-sex marriage surveys has been discovered dumped in Melbourne, with a pile of rain-damaged envelopes destined for East Brunswick discovered in the CBD.

A woman found the pile of letters lying on the footpath between Collins and Little Collins streets.

The woman, who wanted to remain anonymous, said there were up to 10 letters in the pile, with East Brunswick addresses clearly visible.

It’s the second case of undelivered survey forms to affect the left-leaning suburb.

On Monday, Brunswick resident Kerry Ford found 17 addressed and unopened survey envelopes dumped in front of her children’s cubby house.

The letters were addressed to houses in surrounding streets and some had been eaten by snails.

Ms Ford said her own postal survey had also been stolen.

Amalia Buckerfield was one of the intended recipients of the latest batch found dumped in the CBD.

Ms Buckerfield said she lived in an apartment block, with mailboxes outside.

Several other residents had already reported having survey forms stolen.

Ms Buckerfield said the thefts undermined the integrity of the survey’s results, to be announced on November 15.

“It diminishes the value of everyone having an equal say and a democracy where everyone can have their say,” she said.

She said she still planned to vote and had called the Australian Bureau of Statistics, which is running the non-compulsory survey, to order a new form.

“Love is love and love is beautiful. I want to vote yes and make my vote count,” she said.

In August, the ABS fronted an inquiry about the non-binding, non-compulsory poll and conceded that the postal vote process and fraud prevention would rely on individuals reporting missing survey forms.

The bureau also acknowledged it could not prevent people filling out other people’s forms.

A spokeswoman for Australia Post said the incident sounded like theft after delivery.

“If anyone suspects mail tampering or theft has taken place, we recommend they contact local police immediately,” she said.

Victorians should receive their postal vote envelopes by September 25.

Those whose postal vote is missing or has not arrived can request a replacement form from the ABS between September 25 and by 6pm, October 20.

It is believed that 10 million voting papers have already been sent out, of the 16 million that will reach Australians who are eligible and registered to vote.

Votes must be returned by no later than October 27.